To 230 grams of 10% sodium chloride solution, 20 grams of solid salt was added. Calculate the mass

To 230 grams of 10% sodium chloride solution, 20 grams of solid salt was added. Calculate the mass fraction of salt in the resulting solution.

Find the mass of NaCl in the original solution:

m1 (NaCl) = mr.-pa1 (NaCl) * w1 (NaCl) / 100 = 230 * 10/100 = 23 (g).

Let’s find the mass of NaCl in the new solution:

m3 (NaCl) = m1 (NaCl) + m2 (NaCl) = 23 + 20 = 43 (g).

Find the mass of the new NaCl solution:

mr.-pa3 (NaCl) = m.-pa1 (NaCl) + m2 (NaCl) = 230 + 20 = 250 (g).

Let’s find the mass fraction of NaCl in the new solution:

w3 (NaCl) = (m3 (NaCl) / mp.-pa3 (NaCl)) * 100 = (43/250) * 100 = 17.2 (%).