Question

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STOICHIOMETERY!!!

Equation
NaCO3 + CaCl2= 2NaCl + CaCO3

If you wanted to make exactly 2.00g of chalk, what volume of 0.40 M calcium chloride solution would you need to use?? ​

Answer 1

0.05 liters of 0.40 M calcium chloride solution

Explanation:

We have the following chemical reaction:

Na₂CO₃ + CaCl₂= 2 NaCl + CaCO₃

Chalk is calcium carbonate CaCO₃.

number of moles = mass / molecular weight

number of moles of CaCO₃ = 2 / 100 = 0.02 moles

From the chemical reaction we see that 1 mole of calcium chloride (CaCl₂) produces 1 mole of calcium carbonate (CaCO₃), so to produce 0.02 moles of calcium carbonate (CaCO₃) we need 0.02 moles of calcium chloride (CaCl₂).

molar concentration = number of moles / volume (L)

volume = number of moles / molar concentration

volume of calcium chloride solution = 0.02 / 0.4 = 0.05 liters

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