Amordant is a substance that combines with a dye to produced a stable fixed colour in a dyed fabric. calcium acetate is used as a mordant. it is prepared by the reaction of acetic acid with calcium hydroxide.
2ch3co2h + ca(oh)2 ? ca(ch3co2)2 + 2h2o
what mass of ca(oh)2 is required to react with acetic acid in 25.0 ml of a solution having a density of 1.065 g/ ml and containing 58.0% acetic acid by mass?

Answer : The mass of required is 9.3092 grams.

Explanation :

First we have to calculate the mass of solution.

Now we have to calculate the mass of acetic acid.

As we are given that the 58.0 % acetic acid by mass. That means, 58.0 grams of acetic acid present in 100 grams of solution.

As, 100 g of solution contains 58.0 g of acetic acid

So, 26.625 g of solution contains of acetic acid

Now we have to calculate the moles of acetic acid.

Molar mass of acetic acid = 60 g/mole

Now we have to calculate the moles of .

The balanced chemical reaction is,

From the balanced reaction we conclude that,

As, 2 moles of react with 1 moles of

So, 0.257 moles of react with moles of

Now we have to calculate the mass of .

Molar mass of = 74 g/mole

Therefore, the mass of required is 9.3092 grams.

first one is the correct answer