Q. 9.15 - An Introduction to General, Organic, and Biological Chemistry

Question

Calculate the number of equivalents in each of the following: 

a. $1\text{ mole of }{\mathrm{K}}^{+}$

b. ${\text{2 moles of OH}}^{-}$

c. $1{\text{ mole of Ca}}^{2+}$

d. ${{\text{3 moles of CO}}_3}^{2-}$

Step-by-Step Solution

Answer

(part a) The number of equivalents in $1\text{ mole of }{\mathrm{K}}^{+}=1 eq$

(part b) The number of equivalent in ${\text{2 moles of OH}}^{-}\text{= 2eq}$

(part c) The number of equivalent in $1{\text{ mole of Ca}}^{2+}\text{=2 eq}$

(part d) The number of equivalent in ${{\text{3 moles of CO}}_3}^{2-}=6 eq$

Step1: Introduction (part a).

The number of equivalents seems to be the amount of electrons or ions which can be transmitted in a chemical reaction.

Step2: Given Information (part a).

$1\text{ mole of }{\mathrm{K}}^{+}$

Step3: Explanation (part a).

Every mole has one equivalent for an ion with a charge of $+.$

Hence, $1\text{ mole of }{\mathrm{K}}^{+}=1 \mathrm{eq}$

Step4: Given Information (part b).

${\text{2 moles of OH}}^{-}$

Step5: Explanation (part b).

Each mole has one equivalent for just an ion with a charge of $-.$

Hence, ${\text{2 moles of OH}}^{-}\text{= 2eq}$

Step6: Given Information (part c).

$1{\text{ mole of Ca}}^{2+}$

Step7: Explanation (part c).

Each mole has two equivalents for something like an ion with a charge of $2+.$

Therefore, $1{\text{ mole of Ca}}^{2+}\text{=2 eq}$

Step8: Given Information (part d).

${{\text{3 moles of CO}}_3}^{2-}$

Step9: Explanation (part d).

Each mole has two equivalents for such an atom with a charge of $2^{-}.$

Hence, ${{\text{3 moles of CO}}_3}^{2-}=6 eq$