Calculate the mass fraction of sodium hydroxide in the solution that is formed by adding 150 g of water to a solution of sodium hydroxide weighing 450 g with a mass fraction of alkali of 5%
1. Calculate the mass of alkali in the initial solution:
mout (NaOH) = wout (NaOH) * mout (solution) = 0.05 * 450 = 22.5 g;
2. find the mass of the solution obtained by adding water:
mpol (solution) = mout (solution) + madd (H2O) = 450 + 150 = 600 g;
3.Calculate the mass fraction of sodium hydroxide in the resulting solution:
wpol (NaOH) = mout (NaOH): mpol (solution) = 22.5: 600 = 0.0375 or 3.75%.
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.