Chapter 22, Problem 1SAQ

Interpretation Introduction

To find: The formula of aluminosilicate.

Answer to Problem 1SAQ

Correct answer: The formula of aluminosilicate is ${\text{Na}}_{\text{3}}\left({\text{Al}}_{\text{3}}{\text{SiO}}_{\text{8}}\right)$. So, the correct answer is option (c).

Explanation of Solution

Justify reasons for the correct statement:

The ${\text{AlO}}_{\text{2}}{}^{-}$ units substitute for three-fourths of ${\text{SiO}}_{\text{2}}$; therefore, the formula has three units of ${\text{AlO}}_{\text{2}}{}^{-}$ for every ${\text{SiO}}_{\text{2}}$ unit. Balance the charge of every ${\text{AlO}}_{\text{2}}{}^{-}$ ion in the formula by an $N{a}^{+}$ ion.

Thus, the formula for aluminosilicate is as follows:

${\text{Na}}_{\text{3}}{\left({\text{AlO}}_{\text{2}}\right)}_{\text{3}}\left({\text{SiO}}_{\text{2}}\right)$ or ${\text{Na}}_{\text{3}}\left({\text{Al}}_{\text{3}}{\text{SiO}}_{\text{8}}\right)$

Hence, option (c) is correct.

Conclusion

The correct answer is option (c).