Chemistry, 28.01.2020 06:31 yarielperez5788

Which of the following aqueous solutions contains the greatest number of ions?

a. 400. ml of 0.10 m nacl;
b. 300. ml of 0.10 m cacl2;
c. 200. ml of 0.10 m fecl3

Answers: 2

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Answer from: heartykwarteng12

Answer : The correct option is, (b) 300. mL of 0.10 M CaCl₂

Explanation :

We have to calculate the number of moles of ions for the following aqueous solutions.

(a) 400. mL of 0.10 M NaCl

$NaCl\rightarrow Na^++Cl^-$

NaCl dissociates to give 2 moles of ions.

$\text{Moles of ion}=\text{Molarity of }NaCl\times \text{Volume of solution (in L)}$

Volume of solution = 400. mL = 0.400 L

$\text{Moles of ion}=0.10M\times 0.400L=0.04mol$

Total moles of ion = 0.04 mol × 2 = 0.08 mol

(b) 300. mL of 0.10 M CaCl₂

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

CaCl₂ dissociates to give 3 moles of ions.

$\text{Moles of ion}=\text{Molarity of }CaCl_2\times \text{Volume of solution (in L)}$

Volume of solution = 300. mL = 0.300 L

$\text{Moles of ion}=0.10M\times 0.300L=0.03mol$

Total moles of ion = 0.03 mol × 3 = 0.09 mol

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

FeCl₃ dissociates to give 4 moles of ions.

$\text{Moles of ion}=\text{Molarity of }FeCl_3\times \text{Volume of solution (in L)}$

Volume of solution = 200. mL = 0.200 L

$\text{Moles of ion}=0.10M\times 0.200L=0.02mol$

Total moles of ion = 0.02 mol × 4 = 0.08 mol

From this we conclude that, CaCl_2 aqueous solutions contains the greatest number of ions.

Hence, the correct option is, (b) 300. mL of 0.10 M CaCl₂

Answer from: Quest

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

Answer from: Quest

definition

entropy is a measure of the randomness or the extent of disorder of a chemical process.

enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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Which of the following aqueous solutions contains the greatest number of ions?

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