200 g of 30% sodium chloride solution was mixed with 800 g of water. the proportion of sodium

| July 3, 2021 | education

200 g of 30% sodium chloride solution was mixed with 800 g of water. the proportion of sodium chlorine in the new solution?

1. Let’s calculate the mass of the dissolved salt in the first solution using the formula for finding the mass fraction: w = (mr.w / mr-ra) * 100%, where the mass of the soluble salt to be found; mr-ra is the mass of the solution; w is the mass fraction of sodium chloride in the solution.
mr.v = (w * mr-ra) / 100%;
mr.w = (30 * 200) / 100% = 60 (g);
2. After mixing the solution with water, the mass of the solution changes. Let’s calculate the mass of the new solution:
200 + 800 = 1000 (g).
3. Let’s calculate the mass fraction in the new solution:
w = (60/1000) * 100% = 6%
Answer: the mass fraction of sodium chloride in the new solution is 6%.



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