## 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?

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