Question

1. Calculate the no. Of grams of water that must be added to 16 grams of sugar in the preparation of 25% sugar solution
2. Calculate the grams of solute that must be dissolve in a. 350g of water in the preparation of 15% potassium sulfate solution b. 15g of water in the preparation of 10% sodium chloride solution

Answer 1

Answer on Question #49606, Chemistry, Other

**Task:**

1. Calculate the no. Of grams of water that must be added to 16 grams of sugar in the preparation of 25% sugar solution

2. Calculate the grams of solute that must be dissolve in

a. 350 g of water in the preparation of 15% potassium sulfate solution

b. 15 g of water in the preparation of 10% sodium chloride solution

**Answer:**

1)

$$\% = \frac{m_{(sugar)}}{m_{(sugar)} + m(H_2O)} \cdot 100\%$$ $$25\% = \frac{16}{16 + m(H_2O)} \cdot 100\%$$ $$m(H_2O) = \frac{16 \cdot 100}{25} - 16 = 48\ g$$

2)a)

$$\% = \frac{m_{(K_2SO_4)}}{m_{(K_2SO_4)} + m_{(H_2O)}} \cdot 100\%$$ $$15\% = \frac{m_{(K_2SO_4)}}{m_{(K_2SO_4)} + 350} \cdot 100\%$$ $$m_{(K_2SO_4)} = 0.15(m_{(K_2SO_4)} + 350)$$ $$m_{(K_2SO_4)} = 61.8\ g$$

b)

$$\% = \frac{m_{(NaCl)}}{m_{(NaCl)} + m_{(H_2O)}} \cdot 100\%$$ $$10\% = \frac{m_{(NaCl)}}{m_{(NaCl)} + 15} \cdot 100\%$$ $$m_{(NaCl)} = 0.1(m_{(NaCl)} + 15)$$ $$m_{(NaCl)} = 1.67\ g$$

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