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prisoha [69]
3 years ago
5

A different consideration of hardness is an issue that applies to the chemistry of swimming pool water. In this case, appreciabl

e hardness is desired because it deters the pool water from leaching minerals, for example, from tile grout. You analyze the pool water for a friend and determine it has calcium hardness of 175 mg/L as CaCO3. The professional pool maintenance guideline is that calcium hardness should be between 5 and 10 millimoles Ca2 per liter. You convert the concentration expressed as 175 mg/L CaCO3 to compare it to the Ca2 guideline. What is the concentration of Ca2 in mM
Business
1 answer:
kenny6666 [7]3 years ago
3 0

Answer:

1.748 mM

Explanation:

Concentration in g / L = Molarity × molar mass

molar mass of calcium carbonate = 100.0869 g/mol

175 mg/L =    175 ÷ 1000 = 0.175 g/L

0.175 g/L = Molarity × 100.0869 g/mol

(0.175 g/L) / 100.0869 = Molarity

Molarity = 0.001748 M

CaCO₃ → Ca²⁺ + CO₃²⁻ when it dissociate in water.

1 M of  CaCO₃ yielded 1 M of Ca²⁺

0.001748 M of  CaCO₃ will also yield 0.001748 M of  Ca²⁺

then 0.001748 × 1000 = 1.748 mM concentration of Ca²⁺

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