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A 250.OmL sample of a solution containing potassium dichromate as the only solute was evaporated to dryness, then the residue was carefully dried in the oven at the...

Question

A 250.OmL sample of a solution containing potassium dichromate as the only solute was evaporated to dryness, then the residue was carefully dried in the oven at the recommended temperature. The oven-dried residue weighed 16.58grams . What was the molarity of the potassium dichromate solution?Select one: 0.1250M 0.2254M 0.8000m d. 0.1250M 0.5730M

A 250.OmL sample of a solution containing potassium dichromate as the only solute was evaporated to dryness, then the residue was carefully dried in the oven at the recommended temperature. The oven-dried residue weighed 16.58grams . What was the molarity of the potassium dichromate solution? Select one: 0.1250M 0.2254M 0.8000m d. 0.1250M 0.5730M



Answers

Some $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$, with a mass of $2.335 \mathrm{~g}$, is dissolved in enough water to make $500 . \mathrm{mL}$ of solution. (a) What is the molarity of the potassium dichromate? (b) What are the concentrations of the $\mathrm{K}^{+}$ and $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$

Yeah. All right. So let's say that we have um 2.335g of potassium die Chrome eight In 500 ml of solution. And let's try to figure out what the mola parity is for this. So remember more clarity. His moles of solute over leaders of solution. And so we know in this particular case we have grams we can convert that into molds for our salute And our solutions 500 which we can convert into leaders. So We have our 2335 g In 500 ml. And so let's convert grams to moles by using molar mass Mueller mass here is two 94 0.1 85 g. We know that there's 1000 ml in a leader. And so our grams cancel out our milliliters cancel that are left with moles per liter, which is more clarity. And so we have .0159 moles per liter of our potassium die chrome eight. Now, what does that mean for the ions in solution? Because potassium are soluble compounds. So when we put this into solution we're going to get to potassium ions oh and the dick romain ion stays together. So if I want to know the polarity right? If I have point No 159 moles per liter, that must mean for the potassium I'm going to have twice that amount. And the decree mate coefficients one. So it's still the same amount. Yeah so the concentration of the potassium is point 0318 moles per liter. And the concentration of the cr cr two oh seven ion mm It's still a .0159 moles per liter. Yeah. Yeah.

Tombo over chapter six. Question 26. We're sensible military. So first up this thing would you here for Eastern Grams beyond ourselves, Enough. One of the biggest stories over the years Resolution. So you have to convert worry seven grams. Oh, case you terms that the more months is only for grams leaning over one law with shield 0.63 more most per leaders. They have to convert the milliliters clear so is broken to me flying 37 Mm. When you do your calculation, you and getting 1.68 moaner for being you have a chip points against gross sold in 120 many years of solutions. So you have to do You may need to 0.6 or suit Cruz two groups and then times it by for everyone more. There is over long during well, 342 Gramps, use your vision, your print to form move and then you'd have to cover the leaners. So 13 year treat my man, the nurse is gonna be 130.72 friends leaners you, you get 1.33 Moelis time for seeing you haven't played three grams. So when something. I'm starting to wonder. Find leaders. So it was being your 9.3 rooms. Terms of brother More mercy for everyone. No, There he is. 132 grams of ammonia. Sophie which would yield you my old seven moles. The men divine leaders with you don't have to convert reviews you and you're hurting. I do this calculation you again for no to

There's this additional problem Number 42. So we have given, uh, we need to convert it into malls. So we know that, uh, given us 2.335 g. Okay To see or two or seven? Yes, in 200 Mom. Steve, I did buy to 94.9 from which becomes serial point to the little 794 months. Mhm. No, Muller concentration. Off fashioned Ikram. It will be little point data was little 79 floor. I am. Did you a favor? Yes. 0.501? Which is zero point. They don't want 59 malls. My toes which finally acknowledge Israel finds it. 159 months. So now we need to find the more concentration off. Okay, which is, uh, to in those they don't mind. Yeah, a little 159 Um, the 0.31 Hey, hate on and mother Constitutional CR president toe will be little point. Made a lot. 159 months

Or this question. Let's first start by writing are balanced chemical equation. We're going to have potassium permanganate, a solid acid produce carbon dioxide and manganese dioxide. Break this apart into two separate half reactions. Well, first we'll get rid of the Spectators here. Spectator potassium coming up for minus here. Uh H. C to four o'clock, acid, carbon dioxide And four plus we'll get rid oxide spectator. Now we can break this apart and then four two and then four plus. Mhm 40 12 balance the oxygen 88 Plus two bounce hydrogen And three electrons to balance the charge. Yeah, they can have reaction. Put it to here. Developed the carbons oxygen is already balanced. Sounds hydrogen. I was charged Those colors multiple for electron. The 6th soul multiply to give us six electrons on each side. So we're going to double first half reaction. Yeah, Yeah. And then multiplies from by three. Yeah. Okay, Okay. Yeah, electrons of Council 10 hydrogen is there and balanced equation Umno four minus three. HTC 12 4 10 H plus two. MN 4 plus 602 82. And there's a balanced equation for part B. Yeah. What is the polarity of the exotic acid? Using the given information. So let's first off for the molds of the potassium permanganate Which is equal to the polarity .300 moller times the volume will convert to Leaders. 20 ml is .0-00 Leaders. And this gives us a .00600 moles of the potassium from Anthony. Yeah 00600 moans of the potassium permanganate. One more of discussing preventing together one more the permanganate iron. Now from a balanced equation two moles deep originate and I am equivalent to three moles. The oxalic acid should give us 00900 moles of the oxalic acid. Yeah. And now we can calculate from clarity of the oxalic acid. Yeah. Is equal the number of moles divided by the volume. 13.7 mL 0.137 leaders. This gives us similarity of 0.657 moller for the majority of the oxalic acid. For part B or part C. What is the mass of the manganese for oxide forms? So we know the moles of the potassium permanganate from part B. So we'll start with .00600 moles of the potassium permanganate. Yeah. one more test information needs. Yeah. It's equivalent to one mole of parang in it. And I am two moles of the permanganate and I in its equivalent to few moles 84 plus one more Uh manganese. four plus equivalent to one more. Yeah, bringing these dioxide Or maybe these four oxide Time's going here. one mole of manganese peroxide Has a mass of 86.9 g. Yeah, And this gives us a massive point 5-1 g of the manganese four oxide? What?


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