# Calculate the amount of the substance and the mass of water that is formed during the neutralization of NaOH

Calculate the amount of the substance and the mass of water that is formed during the neutralization of NaOH with a mass of 4 g: a) hydrochloric acid b) sulfuric acid c) phosphoric acid Indicate the type of reaction

Given:
m (NaOH) = 4 g

Find:
n (H2O) -?
m (H2O) -?

1) n (NaOH) = m / M = 4/40 = 0.1 mol;
a) HCl;
2) NaOH + HCl => NaCl + H2O;
3) n (H2O) = n (NaOH) = 0.1 mol;
4) m (H2O) = n * M = 0.1 * 18 = 1.8 g;
b) H2SO4;
5) 2NaOH + H2SO4 => Na2SO4 + 2H2O;
6) n (H2O) = n (NaOH) = 0.1 mol;
7) m (H2O) = n * M = 0.1 * 18 = 1.8 g;
c) H3PO4;
8) 3NaOH + H3PO4 => Na3PO4 + 3H2O;
9) n (H2O) = n (NaOH) = 0.1 mol;
10) m (H2O) = n * M = 0.1 * 18 = 1.8 g.

Answer: The amount of substance H2O is 0.1 mol; weight – 1.8 g. One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.