Question

What volume of water should be added to 4.6 g of KCl to make 4m solution

Answer 1

Answer:

Explanation:

We want 4M, or 4 moles/liter.  4.6g of KCl is (4.0g KCl/74.55g/mole KCl) = 0.0617 moles of KCl.

Write the definition of Molar and set the volume to X ( X will tell us how many liters are needed to make a 4M solution from 0.0617 moles of KCl)

4.0M = (0.0617 moles KCl)/X

(4.0 moles/liter)*X = 0.0617 moles KCl

X = (0.0617 moles KCl)/(4.0 moles KCl)

X = 0.0154 liters, or 15.4 ml

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[(0.0154 liters)*(4.0 moles/liter) = 0.0617 moles KCl]