Calculate the mass fraction of sodium hydroxide in the solution that is formed by adding 150 g of water to a solution

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%.

Answer: 3.75%.



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