14. All the following are reasons why back titration is carried out for some rea

Question

14. All the following are reasons why back titration is carried out for some reagents except a. Volatility b. Some of the reagent react two fast c. Insoluble salts d. Some reagent react too slow. 15. In the determination of molar mass of a basic oxide, a back titration method was used wherewas added to the basic oxide followed by determination of the amount of acid remaining by direct titration with a base. - a. A known amount of a base A unknown amount of an acid A known amount of standard excess acid A known amount of standard excess base b. c. d. 16. According to the solubility rules, all chlorides salts are soluble in water except a. NaCI b. AgCI 17. All the following are chemical processes that can lead to the removal of ions from solution, thus serving as driving force for metathesis to occur except e. Formation of a precipitate f. Formation of a strong electrolyte g. Formation of a gas that escapes from solution h. Formation of weak electrolyte 18. (8pts)Give the appropriate glassware or instrument for the following measurement Deliver exactly 10.00 ml solution of ether To measure 2.50g pellets of sodium hydroxide To measure the boiling point of water To measure 10.50ml of antifreeze solution 19. (8pts)Provide the chemical formula for each of the gases described below A colorless, odorless gas, usually produced a pop sound A gas that smell like a rotten egg Turns limewater milk A brown pungent gas

Explanation / Answer

Ans 14 : b) Some of the reagent react too fast

The back titration can be considered as the reverse titration procedure in which the excess reagent is titrated with a concentration of another reagent. It is done when the reaction occurs too slow , ususally precipitation reactions.

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