1.) A 2.3014 g sample was digested, dissolved, and treated with barium ion to pr

Question

1.) A 2.3014 g sample was digested, dissolved, and treated with barium ion to precipitate the sulfate as BaSO4. After filtration, washing and drying, the dry weight is 0.7586 g. What is the wt% of sulfer in the sample?

a.) 13.567%      b.) 13.57%      c.) 4.5287%       d.) 4.529%

2.) When a dilute solution of a weak base (Ka- 3.5*10^-9) is titrated with a 0.100 M solution of HCl at 25 C, the equilibrium constant for the titration reaction has this  value:

a.) 3.5*10^-9     b.) 2.86*10^8      c.) 2.86*10^9     d.) 2.86*10^-6

Explanation / Answer

Wt% = wt of the solute/ wt of the solution )* 100

=a.) 13.567%

b. d.) 2.86*10^-6

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