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vlada-n [284]
3 years ago
15

A mixture of sodium hydroxide and strontium hydroxide contains a total of 0.19 moles of the two compounds. It requires 100.0 mL

of 2.969 M HCl to neutralize all of the base. How many moles of sodium hydroxide were in the original mixture
Chemistry
1 answer:
9966 [12]3 years ago
7 0

Answer:

0.0831 moles of NaOH were in the original mixture

Explanation:

The strontium hydroxide, Sr(OH)2, requires 2 moles of HCl per mole of hydroxide to be neutralized.

The sodium hydroxide, NaOH, requires 1 mol of HCl per mol of hydroxide.

To solve this question we must write 2 equations:

<em>(1) </em>0.19mol = X + Y

<em>Where X = Moles NaOH; Y = Moles Sr(OH)2</em>

The moles of HCl required are:

0.100L * (2.969mol / L) = 0.2969 moles HCl

0.2969 mol = X + 2Y<em>(2)</em>

Replacing (1) in (2):

0.19mol - Y = X

0.2969 mol = (0.19mol - Y) + 2Y

0.1069mol = Y

Moles X = Moles NaOH:

0.19mol = X + 0.1069mol

X = 0.0831 moles of NaOH were in the original mixture

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