From 350 g of HCL solution with a mass fraction of 3%, 20 g of water was evaporated.
| December 23, 2020 | education
From 350 g of HCL solution with a mass fraction of 3%, 20 g of water was evaporated. What is the mass fraction of NaCl salt in the solution?
The solution to this problem:
Let’s find the mass of salt: 350 * 3% / 100% = 10.5 g.
Find the new mass of the solution: 300-20 = 280
Let’s find a new mass part:
10.5 / 280 * 100% = 3.75%
Answer = 3.75%
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