Question #191305

What will be the mass concentration of the HCl solution if 400 cm3 of water is added to 100 cm3 of a solution with a mass concentration of 10 g / dm3?

Expert's answer

(100 cm^{3}) × (1dm^{3} / 1000 cm^{3}) = 0.1 dm^{3}

**Solution:**

(0.1 dm^{3} HCl) × (10 g HCl / 1 dm^{3} HCl) = 1 g HCl

Mass of solute = 1 g HCl

Volume of solution = 400 cm^{3} + 100 cm^{3} = 500 cm^{3} = 0.5 dm^{3}

Mass concentration = Mass of solute / Volume of solution

Therefore,

Mass concentration = (1 g) / (0.5 dm^{3}) = 2 g/dm^{3}

**Mass concentration = 2 g/dm**^{3}

**Answer: The mass concentration of the HCl solution will be 2 g/dm**^{3}

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