# 11 g of sodium hydroxide was added to 120 grams of 15% sodium hydroxide solution.

June 27, 2021 | education

| **11 g of sodium hydroxide was added to 120 grams of 15% sodium hydroxide solution. Determine the mass fraction of NaOH in the resulting solution.**

Find the mass of sodium hydroxide. For this we use the following formula.

W = m r.v / mr-ra × 100%.

m (NaOH) = m solution × W / 100% = 120 × 0.15 = 18 g NaOH.

We find the mass of the entire solution.

m solution = 120 + 11 = 131 g.

Next, we find the mass of the solute.

m r.w = 18 + 11 = 29 g NaOH.

Next, we find the mass fraction of sodium hydroxide in the resulting solution. We write down the solution.

W = 29g / 131g × 100% = 0.22 × 100 = 22%.

This means that the mass fraction of sodium hydroxide in the resulting solution is 22 percent.

Answer: W (NaOH) = 22%.

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