The mass of water that must be added to 200 g of an 8% sodium hydroxide solution to obtain a 5% solution is equal to ..

univerkov | August 15, 2021 | education

Solution:
1. The mass of pure sodium hydroxide in solution is 200 * 0.08 = 16 grams.
2. 16 grams of sodium hydroxide will remain in the 5% solution. The mass of a five percent solution is 16 / 0.05 = 320 grams.
3. The mass of water to be added is 320-200 = 120 grams.
Answer: 120 grams of water should be added.

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