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Chapter 3: Q 57E (page 171)

Question: There is about 1.0g of calcium, as Ca2+, in 1.0 L of milk. What is the molarity of Ca2+ in milk?

Short Answer

Expert verified

The molarity of Ca2+ in milk is 0.025M.

Step by step solution

01

Determine number of moles

Given the mass of Ca2+= 1.0g

Given the volume of solution (here milk) = 1L

Again, number of moles = (Given mass of Ca2+)/(Molar mass of Ca2+)

= (1.0g/40.08g/mol)

= 0.025 mol

02

Determine the Molarity

Molarity of a solution = Number of moles of Ca2+ / Volume of the solution.

Therefore, by substituting the values, we get

Molarity = 0.025 mol/1L

= 0.025mol/L

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