Type the correct answer in the box. Express your answer to three significant figures.
2 answers:
Answer: Theoretical mass of sodium sulphate ( ) is 514.118 grams.
Explanation: For a given reaction,
As NaOH is used in excess, therefore it is an excess reagent and is a limiting reagent as the quantity of the product will depend on it.
We are given 355 grams of .
Molar mass of = 98.079 g/mol
Molar mass of = 142.04 g/mol
1 mole of is producing 1 mole of
, so
98.079 g/mol of will produce 142.04 g/mol of
355 grams of will produce =
of
Mass of = 514.118 grams
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The molarity of formic acid is 100 mM or . The dissociation reaction of formic acid is as follows:
The expression for dissociation constant of the reaction will be:
Rearranging,
Here, pH of solution is 4.15 thus, concentration of hydrogen ion will be:
Similarly, thus,
Putting the values,
Therefore, the concentration of formate will be 0.2511 M.
