# Excess Na2SO4(aq) is added to a 4.97×102 mL sample of industrial waste containing Ba2+ ions. If 40.5 g of BaSO4(s) are precipitated from the reaction, what was the molar concentration of Ba2+ in the original sample?Ba2+(aq)+ Na2SO4(aq) --> BaSO4(s) + 2Na+(aq)

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Excess Na2SO4(aq) is added to a 4.97×102 mL sample of industrial waste containing Ba2+ ions. If 40.5 g of BaSO4(s) are precipitated from the reaction, what was the molar concentration of Ba2+ in the original sample?

Ba2+(aq)+ Na2SO4(aq) --> BaSO4(s) + 2Na+(aq)

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Step 1

Excess Na2SO4(aq) is added to a 4.97×102 mL sample of industrial waste containing Ba2+ ions. If 40.5 g of BaSO4(s) are precipitated from the reaction, the molar concentration of Ba2+ in the original sample is to be calculated.

Step 2

Write a chemical equation showing reaction between Na2SO4 and Ba2+ ions in a solution.

Step 3

Calculate the moles of BaSO4 precipitated -

Mass of BaSO4 precipitated = 40.5 ...

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