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Molality

One mole Ba...

Question

One mole $B a F_{2}$ is treated with two moles of $H_{2} S O_{4}$ . To make the resulting mixture neutral, $N a O H$ is added. $N a O H$ required in this process is (in moles):

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Solution

$B a F_{2} 1 m o l + H_{2} S O_{4} 1 m o l ⟶ B a S O_{4} 1 m o l + 2 H F 2 m o l$

Given: $1$ mol $2$ mol
Thus, unreacted $H_{2} S O_{4} = 1$ mol
$H F$ formed $= 2$ mol
$H_{2} S O_{4} 1 m o l + 2 N a O H 2 m o l ⟶ N a_{2} S O_{4} + 2 H_{2} O$
$2 H F 2 m o l + 2 N a O H 2 m o l ⟶ 2 N a F + 2 H_{2} O$

Thus, total $N a O H$ required by $= 4$ mol

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