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At 27°C, 58.5g of sodium chloride is present in 250cm\(^3\) of a solution. The sol...


Question

At 27°C, 58.5g of sodium chloride is present in 250cm\(^3\) of a solution. The solubility of sodium chloride at this temperature is?

(molar mass of sodium chloride = 111.0gmol\(^{-1}\))

Options

A) 2.0 moldm\(^{-3}\)

B) 0.25 moldm\(^{-3}\)

C) 1.0 moldm\(^{-3}\)

D) 0.5 moldm\(^{-3}\)

The correct answer is A.

Explanation:

Given the Mass of the salt = 58.5g
Volume = 250 cm\(^3\) = 0.25 dm\(^3\)
Mass concentration = \(\frac{Mass}{Volume}\)
= \(\frac{58.5}{0.25}\) = 234 gdm\(^{-3}\)
Solubility (in moldm\(^{-3}\) = \(\frac{234}{111} \)
= 2.11 moldm\(^{-3}\)
\(\approxeq\) 2.0 moldm\(^{-3}\)

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Dicussion (1)

  • Given the Mass of the salt = 58.5g
    Volume = 250 cm\(^3\) = 0.25 dm\(^3\)
    Mass concentration = \(\frac{Mass}{Volume}\)
    = \(\frac{58.5}{0.25}\) = 234 gdm\(^{-3}\)
    Solubility (in moldm\(^{-3}\) = \(\frac{234}{111} \)
    = 2.11 moldm\(^{-3}\)
    \(\approxeq\) 2.0 moldm\(^{-3}\)

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