# A 51.24 g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many mL of this solution must be diluted with water to make 1.00 L, of 0.100 M Ba(OH)2?

You must dilute 401 mL with enough water to make 1.00 L of solution.

Step 1. Calculate the of the stock solution.

Moles of Ba(OH)₂ = ##”51.24 g Ba(OH)”_2 × (“1 mol Ba(OH)”_2)/(“171.34 g Ba(OH)”_2) = “0.299 05 mol Ba(OH)”_2##

Step 2. Calculate the volume of stock solution that is needed.

See

##c_1V_1 = c_2V_2##

##c_1## = 0.2492 mol/L; ##V_1## = ?
##c_2## = 0.100 mol/L; ##V_2## = 1.00 L

##V_1 = V_2 × c_2/c_1## = ##”1.00 L” × “0.100 mol/L”https://studydaddy.com/”0.2492 mol/L”## = 0.401 L = 401 mL

So, to make your solution, you would dilute 401 mL of stock solution with enough water to make 1.00 L.

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