1.The amount of lactic acid, HC3H5O3, produced in a sample of muscle tissue was analyzed by reaction with hydroxide ion. Hydroxide ion was produced in the sample mixture by electrolysis. The cathode reaction is given below.
2 H2O(l) + 2 e ? ? H2(g) + 2 OH ? (aq)
Hydroxide ion reacts with lactic acid as soon as it is produced. The endpoint of the reaction is detected with an acid-base indicator. It required 104 s for a current of 18.3 mA to reach the endpoint. How many grams of lactic acid (a monoprotic acid) were present in the sample?
4.Calculate the maximum work available from 36.0 g of aluminum in the following cell when the cell potential is 1.15 V. Note that O2 is reduced to H2O.
Al(s) | Al3+(aq) || H+(aq) | O2(g) | Pt
5. Chlorine, Cl2, is produced commercially by the electrolysis of aqueous sodium chloride. The anode reaction is below.
2 Cl ?(aq) ? Cl2(g) + 2 e?
How long will it take to produce 1.09 kg of chlorine if the current is 5.00 102 A in seconds ?