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Standard X

Chemistry

Gay Lussac's Law

1 L of pond w...

Question

$1 L$ of pond water contains $20 m g$ of $C a^{2 +}$ and $12 m g$ of $M g^{2 +}$ ions. What is the volume of a $2 N N a_{2} C O_{3}$ solution required to soften $5000 L$ of pond water ?

500 L

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50 L

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5 L

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Solution

The correct option is B $5 L$
Milli-equivalents of $C a^{2 +}$ + milli-equivalents of $M g^{2 +}$
= milli-equivalents of $N a_{2} C O_{3}$
$\frac{20}{20} + \frac{12}{12} = V \times 2$
$∴ V = 1 m L$ for $1 L$ of tap water
For $5000 L$ of pond water
$V = 5000 m L$ or $5 L$

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1 L of pond water contains 20 mg of Ca2+ and 12 mg of Mg2+ ions. What is the volume of a 2 N Na2CO3 solution required to soften 5000 L of pond water ?

The correct option is B 5 LMilli-equivalents of Ca2+ + milli-equivalents of Mg2+ = milli-equivalents of Na2CO3 2020+1212=V×2 ∴V=1mL for 1L of tap water For 5000L of pond water V=5000mL or 5L

$1 L$ of pond water contains $20 m g$ of $C a^{2 +}$ and $12 m g$ of $M g^{2 +}$ ions. What is the volume of a $2 N N a_{2} C O_{3}$ solution required to soften $5000 L$ of pond water ?

The correct option is B $5 L$
Milli-equivalents of $C a^{2 +}$ + milli-equivalents of $M g^{2 +}$
= milli-equivalents of $N a_{2} C O_{3}$
$\frac{20}{20} + \frac{12}{12} = V \times 2$
$∴ V = 1 m L$ for $1 L$ of tap water
For $5000 L$ of pond water
$V = 5000 m L$ or $5 L$