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Suppose you were preparing 1.0 L of a bleaching solution in a volumetric flask,

ID: 892291 • Letter: S

Question

Suppose you were preparing 1.0 L of a bleaching solution in a volumetric flask, and it calls for 0.25 mol of NaOCl. If all you had available was a jug of bleach that contained 0.85 M NaOCl, what volume of bleach would you need to add to the volumetric flask before you added enough water to reach the 1.0 L line? (Two significant figures in mL)
Suppose you were preparing 1.0 L of a bleaching solution in a volumetric flask, and it calls for 0.25 mol of NaOCl. If all you had available was a jug of bleach that contained 0.85 M NaOCl, what volume of bleach would you need to add to the volumetric flask before you added enough water to reach the 1.0 L line? (Two significant figures in mL)

Explanation / Answer

V = 1L

M1 = 0.25 mol of NaOCl

M2 = 085 M NaOCl

volume needed

V1*M1 = V2*M2

1L*.25 = 0.85*V2

V2 = 0.29 liters

or 294 ml

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