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Question 5The process by which the concentration of a solution is accurately as weighed and titrated is called:Not yet answeredMarked out of 2. 00Select one: Standa...

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Question 5The process by which the concentration of a solution is accurately as weighed and titrated is called:Not yet answeredMarked out of 2. 00Select one: Standard deviationFlag questionAnalytical concentrationStandardizationAccuracyPrimary standard

Question 5 The process by which the concentration of a solution is accurately as weighed and titrated is called: Not yet answered Marked out of 2. 00 Select one: Standard deviation Flag question Analytical concentration Standardization Accuracy Primary standard



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The following molarities were calculated from replicate standardization of a solution: $0.5026,$ $0.5029,0.5023,0.5031,0.5025,0.5032,0.5027,$ and $0.5026 \mathrm{M} .$ Assuming no determinate errors, within what range are you $95 \%$ certain that the true mean value of the molarity falls?

Have an equation of mm plus two plus a metaphor minus. We yield Emmental to sell it and we're gonna balances in basic solution. And what happens is this situation we require 78.42 millimeters a 0.499 Moeller solution. Oh, permanganate iron. And then that will titrate from accumulators off. Mm plus, too. So we're trying Figure out what the concentration of the manganese to Lyon ISS first, Before we can do in exploit, we have to balance this redox reaction so the first step should be to split it into 2/2 reactions. So since there's only one product, although the reactors will go to the product and then was put the other one to M and four minus to M N 02 So the first step should be to split a word that the second step should be to balance any non oxygen or hydrogen atoms. So manganese, manganese, his bones, the manganese, manganese bonds Next service bombs any oxygen's by adding water. So I have to oxygen's here, so I'm gonna to waters on the other side and then on the bottom. I have four options here, so I'm gonna to waters on the product side. We're gonna balance hydrogen by adding H bosses. I have four Hodgins on this react in sight. So I'm gonna add for Hodgins on the product side and then for the bottom 1/2 or Hodgins on the react inside. So I'm going to out for Hodgins on the product side. And now we have to balance electrons. We have to bounce charges by adding electrons. The world charge of this IBIs positive two there will charge of this that it's positive for. So I'm gonna add to elections to make it equal to positive two. So that way, Boulder reactors and products of the same charge and then for the bottom. This side hasn't a role Charge of zero, and this side has an overall charge of positive three. So I'm gonna three elections to get it to equal to the other side, which is here now, for this to be a proper reduction, the same one elections have to be gain us lost. So those two have to be the same number. I'm gonna multiply this equation by three to get it to be sex elections. And I'm gonna most play this whole equation by to to get it to be six electrons. So I'm gonna rewrite the equations with the new numbers of three times to a sex water plus three times once, three mn pasu plus three times one is three I m in 02 plus three times four is 1200 irons, plus three times to a six elections. And then I'm animal to buy this whole equation by two. So, to some streets, six elections plus two times four is eight plus two times one is two. We yield to Emma. No, to plus four waters. Now we cancel elections, and then we can. So anything that we subtract anything as an opposite sides and we add anything that it's on the same side. So notice that we have a Hodgins on the side and 12 when this one. So we're gonna subtract a from both sides, giving me 400 iam's and then waters. We have four waters here in six orders here. So we're gonna truck floor from both sites, given me to Waters, and then I have Emma no, to repeat it on the same side. So we're gonna add those two. Give me 59 age five M and oh, too. Now we're gonna put it together to H 20 plus three mm plus two was to Emina. Four minus will yield five I m in 02 plus or age plus. No, because we're in basic solution for every 100 in I am. You're gonna add hydroxide times and I always like to balance it first as an acidic reaction and then add extra step for the basic solutions. That way you get used to one method very quickly and you just have to do one extra step. So then I'm gonna for hydroxide. It's on bullet sites and thou give me hydroxide and hydrogen combine to make water. So give me four waters and then, since I have duplicates, we subtract two waters from both sides giving me to waters. So when I rewrite that equation so I have 40 H minus plus three m m plus two plus two Emina for minus. We yield five Emmental two plus two h 20 Now, the last thing you should do is check charges. The overall charge of this site is here and they're overcharge of this negative four plus positive six plus negative two, which is two times. So notice that those this series with two times they could have won the second of 23 times positive to this positive 64 times negative One is thinking of four. So this this year and this equation is bounce. So now we're gonna do stick. So I know that I have 78.42 milliliters of this. And 0.4997 Ruler. I'm gonna find the concentration of this. And I know I have 50 milliliters, so I need to find the moles off em. And plus two so m and close to I'm going to raise is right here. So we don't get confused because find Mueller similarity. Your concentration is malls. Oh, Mm. Possum per leaders. All solution. And we know we have. We need 15 familiars of dissolution right here. So we need to find the most because where do you know the volume on the volume to go for milliliters? Two leaders. We the vibe. 1000. So we're gonna divide this about 1000 it gives me point. 052466123 Leaders. So now I just need the most, and then we're here, and that will give me concentration. So we're gonna use this to find the malls off em and Boston. So I start with the volume in leader. So I'm gonna take this about of our 1000.0, 7842 leaders. Oh, Eminem four. And if you ask yourself Well, how do you decide which of those two start I started with the one that is only one unit. Moeller is really more poor leader. So that's a conversion factor. So if you have something that is one unit only, then start with that. If possible. Sometimes you can't help. But what in this case is you can. So then leaders of Emma four will go on the bottom to cancel that. And then the conversion is two moles Oh, Emina four minus that Malls O M N 04 minus two malls of M and plus do which is what I want. Most of leaders were used the wolrd for just points or 997 moles and one leader and the most smalls we use the coefficients Mm Bush suis three and Emmental Forest too. And that we cancel units. Leaders cancel. Most cancel giving me moles. Oh Mm. Plus suit, which is what I want. And then we multiply across the wide by the bottom and we get the most of them in plus two to be 0.0 58. 78. So, Doriane, take that number and put her here. 0.0 58 78. Most of em and pasta words I traded. Take that. The bottom right point or 50 and it gives you a concentration of 500.11 76 more.

Problem. 0.6 trapped 11 uh, for an Astra base, when it's the normality of solution equal to the malaria solution and wondered to concentration is different. So when we talk about normality were basically we can. We're talking about a concentration so usually used polarity as our frustration, like resemble 11 atom. One Moeller Constant Concentration Vision station Normality is more a function of the US is more function of the equivalent species in solution. Let's say you have H A yield H plus plus a minus because H A is equal to the ratio of a J is equal to ratio of H plus and a minus. That means these rolling just in a 1 to 1 to one ratio. So the concentration of age plus that we're gonna have in solution is going to be equal to the concentration of H A in solution and the concentration of a miso solutions will be equal to a concentration of h A. Okay, so on us and you can work with this in the base as well. So b minus Sorry, not B minus. That's, uh, as um b 00 h yield B plus plus oh h minus. You have a 1 to 1 to one ratio. So the concentration of your of the plus can be equal to countries will be a wage and the constellation of hydroxide is going to be people concentration of be awake. So when you have a an acid that has only one an ionized herbal hydrogen and you only have a base one ionized ble hydroxide. That is when the normality of your solution is gonna be equal to the concentration of your solution. Sorry. The normality will be equal to the polarity of your solution when two concentrations of different that's when you have multiple species. So, um, if you were to have h two way yields to H plus was a to minus or the oh h two yield B plus less to H minus. So in the first example, you have one issue way and to which plus so Thea. So the normal. That's so the number of the normality solutions me different than the polarity of your solution. Because you, because the ratio of your of issue way is different, it's the ratio of HD way to each. Plus is not once one similarly bi racial be a wage to two to ah to O H minus. That is not that is not once one one. So if there's only one ionized will Hajer hydroxide and then your polarity equal your normality otherwise as they will not be the same Hey, so in this case, M is equal to end malaria's evil to normality. In this case, polarity is not equal to more normality.

Ah, for an acid or base B. Um, normality is equal to the mill Araji When, um when the number, uh, equivalence. It's equals the number of moles of So you, uh, this is Onley true or acids that donates Onley one proton, proton or bases that, except on me, one proton when the normality is unequal to the polarity, the secures, Um when the, um when the number of equivalence is unequal to the number of moles of Salyut. And in this case here, this is only true for acids that donate more than one proton or bases. Ah, that, um, react with more than one proton s o for the bases. Examples for basis. Here would be, uh, pieces that are calcium hydroxide, magnesium hydroxide. Thes BCE's would react with more than one proton, and that would be the camp, for the normality is not equal to the military. T for acids that don't eat. Um, more than one proton. Let's and go through some examples here. This could be something like h two. So four for each three peel for, um, back to the first case. A couple of examples here acids could be something that each CLR a Channel three with only one proton basis. Here could be bases like any a wage or K awake for some examples.

This question says that in a common medical laboratory determination of the concentration of free chloride ion in blood serum, the serum samples tie traded with H G and a 32 solution. And it gives us the balanced equation for that mutualization reaction. And the question asks, What is the C L minus? Concentration in a 320.25 ml sample of Neural Sierra that requires 1.46 emails of an 8.25 times 10 to the negative fourth Moeller h d n a 32 solution to reach the end point. All right, so it tells us the volume and concentration of the neutralizing re agents. Let's start there, and I'm gonna convert milliliters two leaders, because that's what ah, unit polarity is that so? 1.4 Sex mills is 0.14 six leaders of H G and in 32 and multiply that by the concentration and gives us, which is eight went to five times 10 negative four moles of each. She and oh, three two And that's polarities, That's it. One leader of H G and a 32 And then finally we had to convert from moles of H G and a 3 to 2 Moles of Cory Nayan. And so, from this bounce equation to give us, it takes one mole of H G in 32 to neutralize two bowls of glory and get of coin I on So one more each g 32 to neutralize two moles of court ion Great. Can you have leaders reached Vienna three to canceling out leaders. One was a tree in a three to cancel out moles left with 2.4. Here are nine times tend the negative sex moles. The seal minus. The last step is to figure out the concentration off that seo minus solution or what it was in the serum. So we divide that birth moles point for 09 times 10 negative six morals We'll see all minus over. It tells us it was a 0.25 mil sample again converting to leaders his 0.0 25 leaders. If you saw that, you would see that the concentration of CEO minus is 9.6 times 10 the negative third Moeller, see how my ass


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