Question

Washing soda has formula

• A. $Na_2CO_3 \cdot 7H_2O$
• B. $Na_2CO_3 \cdot 10H_2O$
• C. $Na_2CO_3 \cdot 3H_2O$
• D. $Na_2CO_3$

Answer 1

Answer: (B)

$Na_2CO_3 \cdot 10H_2O$

Answer 2

Washing soda is sodium carbonate decahydrate, so its formula is $Na_2CO_3 \cdot 10H_2O.$