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}))
-
A.
2.0 moldm(^{-3}) -
B.
0.25 moldm(^{-3}) -
C.
1.0 moldm(^{-3}) -
D.
0.5 moldm(^{-3})
Correct Answer: Option 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})
There is an explanation video available below.