Chemistry: Which of the following solutions contains the greatest number of ions? A. 300.0 mL of 0.10 M CaCl2 B. 400.0 mL of 0.10 M NaCl C. 200.0 mL of 0.10 M FeCl3 D. 800.0 mL of 0.10 M sucrose

the answer is A. 1 Explanation:...

Which of the following solutions contains the greatest

Nopernope11

21.01.2022

Answer : The correct option is, (A) 300.0 mL of 0.10 M CaCl₂

Explanation :

(a) 300.0 mL of 0.10 M CaCl₂

The dissociation reaction will be:

$CaCl_2(aq)\rightarrow Ca^{2+}(aq)+2Cl^-(aq)$

To calculate the number of moles of CaCl₂ as :

$\text{Moles of }CaCl_2=\text{Concentration of }CaCl_2\times \text{Volume of solution in L}$

$\text{Moles of }CaCl_2=0.10M\times 0.3L=0.03mol$

As, 1 mole of CaCl₂ contains ions = 3

So, 0.03 mole of CaCl₂ contains ions = 0.03 × 3 = 0.09 ions.

(b) 400.0 mL of 0.10 M NaCl

The dissociation reaction will be:

$NaCl(aq)\rightarrow Na^{+}(aq)+Cl^-(aq)$

To calculate the number of moles of NaCl as :

$\text{Moles of }NaCl=\text{Concentration of }NaCl\times \text{Volume of solution in L}$

$\text{Moles of }NaCl=0.10M\times 0.4L=0.04mol$

As, 1 mole of NaCl contains ions = 2

So, 0.04 mole of NaCl contains ions = 0.04 × 2 = 0.08 ions.

The dissociation reaction will be:

$FeCl_3(aq)\rightarrow Fe^{3+}(aq)+3Cl^-(aq)$

To calculate the number of moles of FeCl₃ as :

$\text{Moles of }FeCl_3=\text{Concentration of }FeCl_3\times \text{Volume of solution in L}$

$\text{Moles of }FeCl_3=0.10M\times 0.2L=0.02mol$

As, 1 mole of FeCl₃ contains ions = 4

So, 0.02 mole of FeCl₃ contains ions = 0.02 × 4 = 0.08 ions.

(d) 800.0 mL of 0.10 M sucrose

The dissociation of sucrose is not possible because it is a non-electrolyte.

To calculate the number of moles of sucrose as :

$\text{Moles of }sucrose=\text{Concentration of }sucrose\times \text{Volume of solution in L}$

$\text{Moles of }sucrose=0.10M\times 0.8L=0.08mol$

As, 1 mole of sucrose contains ions = 1

So, 0.08 mole of sucrose contains ions = 0.08 × 1 = 0.08 ions.

Hence, the solutions contains the greatest number of ions is, 300.0 mL of 0.10 M CaCl₂

0,0(0 оценок)