Question

Paired Exercise 14.2 Incorrect. Recall that there are exceptions to the solubility rules. Of the following substances, which ones are generally soluble in water? Cu(NO3)2 O AgNO3 OFe(OH)3 Ba3(PO4)2 SHOW HINT

Answer 1

14.2

is soluble in water since almost all compounds containing $NO_3^-$ ions are soluble as stated in solubility rules.

MgO is not soluble in water.

$NH_4C_2H_3O_2$ is soluble in water as it contains $NH_4^+$ ion.

$AgNO_3$ is soluble in water. Even though silver salts are not generally soluble, this is an exception to the rule.

$Fe(OH)_3$ is not soluble in water since most hydroxides of transition metal are not soluble.

$Ba_3(PO_4)_2$ is not soluble in water as most phosphates are not soluble according to solubility rules.

Hence, among the given option only are soluble in water.

14.14

(a)

The mass/volume percent is calculated using the following formula:

$mass/volume \ \% = \frac{mass \ of \ solute \ in \ gm }{\ volume \ of \ solution \ in \ ml}\times 100 \%$

Here, we have table sugar as solute, mass of table sugar = 161.2 gm

Voluem of the solution = 284.8 mL

hence,

$mass/volume \ \% = \frac{161.2 \ g}{\ 284.8 ml}\times 100 \% = 56.6 \%$

Hence, the mass by volume percent for the resulting solution is 56.6%.

(b)

Volume of solution = 75.5 ml

Mass of solute, methanol = 31.0 gm

$mass/volume \ \% = \frac{31.0 \ g}{\ 75.5 ml}\times 100 \% = 41.06 \%$

hence, the mass/volume percent for the resulting solution is 41.06%.