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You design a coulometric titration to determine the amountof arsenic in your tea. You do some sample prep so that any arsenicpresent is in the form of HAsO32-. This...

Question

You design a coulometric titration to determine the amountof arsenic in your tea. You do some sample prep so that any arsenicpresent is in the form of HAsO32-. This ionreacts with iodine in the following reaction.HAsO32- + I2 +2HCO3- -> HAsO42-+2I- + 2CO + H2OAfter adding 10g of I- ions in the form of KI, ittakes 11 min and 32 sec at 127.6 mA for all the arsenic to be usedup. How many grams of HAsO32- was in yourtea?

You design a coulometric titration to determine the amount of arsenic in your tea. You do some sample prep so that any arsenic present is in the form of HAsO32-. This ion reacts with iodine in the following reaction. HAsO32- + I2 + 2HCO3- -> HAsO42-+ 2I- + 2CO + H2O After adding 10g of I- ions in the form of KI, it takes 11 min and 32 sec at 127.6 mA for all the arsenic to be used up. How many grams of HAsO32- was in your tea?



Answers

In a titration of cyanide ion, 28.72 $\mathrm{mL}$ of $0.0100 \mathrm{M} \mathrm{AgNO}_{3}$ is added before precipitation begins. [The reaction of Ag' with CN goes to completion, producing the Ag(CN) $_{2}^{-}$ complex.] Precipitation of solid AgCN takes place when excess $\mathrm{Ag}^{+}$ is added to the solution, above the amount needed to complete the formation of $\mathrm{Ag}(\mathrm{CN})_{2}^{-}$. How many grams of NaCN were in the original sample?

The reaction involved. Information off symbol. Cyanide will be aging or the do less do you see in negative, which gives us a G. CNN, too. Make it do the title. A shin off sodium sign night with silver nitride involves the information off it. Easy in after the whole sign it irons are exhausted. Silva Positive wine for finished by excess off a G and Nutri can be the act, so the reaction is represented. US. Injury seeing too negative less Eiji Porter Tip gives to Wendy See him as the precipitation begins after 28.72 women. So hepatitis as the precipitation begins after 28 point seven to Emily Oh, little pointy toe wanted. You don't know Eiji and or three We need to calculate the number off molds off Silver Line present and in off Silver Lion will be Quintal. Polarity multiplied with volume substituting in those value similarities. In 2100 volume will be your 0.72 divided by told him a mile Lito, This will be number. The number of molds turn out to be 2.87 my to pretend this toe negative for morning. As for the reaction. The formation off silver signed night moles off cyanide involved will be double as compared to silver positive wine. So calculating this and seeing negative people too. No lines the mole off Eiji Positive which would be equal to 5.74 Generous to one negative four moles.

Using the Thai trey shin information given it's all for the mass percent of copper in the sample. Let's first start by calculating the moles of the A to S 203 We have the mill Arat E one Moeller and the volume 10.49 millimeters This 0.1049 leaders, This will work out toe 0.1049 Moles of the A two s 203 It's calculate the moles of the s 203 to minus. This would be equal 2.1049 walls of the A two s 23 one more of the A 2 to 3 has one more of s 203 to minus. This would yield 0.1049 moles of the s 203 to minus Now we confined the mass of the copper using the more ratio This is two moles of s 203 to minus to one more I three minus times one mole of I three minus 22 moles Copper two plus one Mole of copper two plus 21 mole copper Andi one mole of copper, 63.55 grounds of copper. And this would yield 0.6666 g of copper, the mass percent of copper In the sample. It's 0.6666 g of copper divided by he 14.90 g sample times 100% and this will work out too 0.4450% and that would be the mass percent of copper in the sample.

Yeah. Hi, everyone. So and in this question, there are two parts A parties. Your first balance. The equation. Because they have given unbalanced equation a free new place like queers. Us a curious plus, I mean no for minus a queers them and off my nurse A queers goods a 33 plus six years. Thank you. Yes, plus a mental glass. A curious no enough step One that is a Zion observation of Myrtle. Each atom, if we do, plus Aquarius less Amen. Or four minus a curious observation state off their mani's last seven gives at fee three bliss, Aquarius Less. Amen to glass. Equus. So, you know, observation number off Iran. Turn this from plus to the plus three. The process is oxidation. Then my name. It's in this from plus one toe plus tau. The process, the casing observation number. And that's why the processes reduction. Then it ain't two separate harp equations. That is oxidation. Okay. You know their fee to bless a curious girls. Your fee. Three plus a curious then introduction. Yeah, men. 04 Minus a curious goods. A man to glass. A curious. Now balance that them other than hydrogen induction siren and magnets are there, and both are balance the next balancing off oxygen so balancing of function can be done in observation. There is no action, so no need to balance it. Clean their feet. Three. Bless a curious. Then in production, there are four auction at religious. So your ad for water while a career at our Ageas their next balancing off hydrogen, you know oxygen. In this case, AP Douglas Aquarius gives a P three plus a curious. Now, in order to balance H plus R hydrogen, there are eight hydrogen at the riches. So your toe end four h plus sorry. Eight h plus at religious Uh huh, plus four water liquid then, uh, balance the charges in order to balance the charges. You know, oxidation process that is a fee to class. Aquarius gives and free three bliss. Curious. So you're tired. Only one electron over here. Similarly, introduction process. You know, eight managed to 66 minus one for you. So the ad for electrons in it a man or for minus acquiesce bless eight h plus, I agree. Yes, Plus for electrons gives they're meant to class. Agree us less for water liquid. Now, once you do this but balance the number of electrons, so multiply. First equation by five and second equation by oh one. So for you, if we do bless agrees, gives for you. MP three plus agrees. Plus filing dance. Similarly, eruption multiplied by one. So a man or four minus a curious plus eight h plus quieres las Why electrons gills? I mean two plus a curious last for water liquid. Now step number seven. I oxidation half reaction interruption, half reaction. What we get is for you every do plus Aquarius plus men or for minus a curious plus eight edge glass acquiesce gives for you a Petri bliss like this less Amen. Two glass acquiesce less forwarder liquid. Yeah. No, You know this sort of balance situation How to check balance for you to retain positive 18 positive minus 1 17 5 threes are 15 plus 2 17. So plus 17 is he called plus 17 charges. And that's what is balance. Secondly, for your IRA on both sides one Magnus on both sides on eight hydrogen on both sides OK, and four option attempts on both sides. And that's what is completely balanced. Now next parties. You know, you can say be part then. Big part a French parties mold saw seminal for youth in Taipei. Shen Yan off. I meant for four minus using vibration. So that is equal to what, 22.45 in do. Okay, line one to yeah, 01 Okay. Divided by 1000. So yeah, that is equal to zero point 00 26 96 245 morel off. Um, in all four minus. Then Secondly, here to calculate moles off a p two plus in the samples malls off every two plus rolls off if he do class now, since from balance equation, we studied for, um, also off a P two plus walls off their feet. Do Plus corresponds to one more off a man off or minus. Well, one more off Germany or four minus and therefore X small off a free two plus eggs. Moles off if he two plus corresponds to 0.0 26 96 before the fire. You mall off. I meant or four minus. Therefore, mhm. Most off a P two plus laws off they're free to class is equal to zero find 002696245 into five. Ah, form one. And that is sequel to zero point zero 13 for Reid to do for you to do fight, then. Thirdly, how to calculate mass off Iran Moss off their fee. That is W that is equal to the number of moles in two molar mass number up malls. Off course if he took us into solar mass off F. So what is that? And zero point 01348 to do for you into the p five point a d fight. So so mhm. Uh, myself ap against NWFP. That is equal toe zero plane sun fire you 2858 grand to get fight grand. No, you too can glade percentage off a fee. We'll send age off fee. That is a call to vote off Effie upon we went off sample sampled into undated. So that is equal to point seven for you to eight. Why you aid the idea to buy one point 012 into I'm David. Therefore was in page a fee you sequel to 74.8 English physical. What? So in the four point day, this one thing


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