Calculate the mass of the chloride acid solution (mass fraction of acid 20%)

Calculate the mass of the chloride acid solution (mass fraction of acid 20%) required to completely neutralize the solution, which contains 0.2 mol of potassium hydroxide.

Write down the solution for determining the mass of the hydrochloric acid solution
First, you need to write down the reaction equation.
HCl + KOH = KCl + H2O.

Next, use the reaction equation to determine the amount of hydrochloric acid substance.
X mol of hydrochloric acid is 0.2 mol of potassium hydroxide.

1 mol of hydrochloric acid – 1 mol of potassium hydroxide.

Determine the unknown value of x.

X = 1 * 0.2: 1 = 0.2 mol.

Therefore, the amount of the hydrochloric acid substance is 0.2 mol.

Next, determine the mass of hydrochloric acid.
n = m / M.

m = n * M.

Where n is the amount of substance.

m is the mass of the substance.

M is the molar mass.

M (HCl) = 1 + 35.5 = 36.5 g / mol.

m = 0.2 mol * 36.5 g / mol = 7.3 g.

Therefore, the mass of hydrochloric acid is 7.3 g.

Next, determine the mass of the hydrochloric acid solution.
W = m r.v. / m r-ra * 100%.

m solution = m r.v. * 100% / W.

m (HCl) = 7.3 * 100/20 = 36.5 g.

Therefore, the mass of the hydrochloric acid solution is 36.5 grams.

Answer: m (HCl) = 36.5 g.