Describe an activity to show that acidic solution conducts electricity.

_____ is a weak acid.

(A) $\mathrm{HCl}$                   (B) ${\mathrm{H}}_2{\mathrm{SO}}_4$                    (C) ${\mathrm{CH}}_3\mathrm{COOH}$

Enter your correct answer as A, B or C.

Washing soda has a chemical formula _____.

(A) ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$                        (B) ${\mathrm{Na}}_2{\mathrm{CO}}_3.{\mathrm{H}}_2\mathrm{O}$                      (C) ${\mathrm{Na}}_2{\mathrm{CO}}_3.2{\mathrm{H}}_2\mathrm{O}$

Enter your correct answer as A, B or C.