CH-1051

Acids and alkalis

Chemistry · Secondary 4 · Easy · Acids and alkalis

A solution of sodium hydroxide is tested with Universal Indicator and turns dark purple. Which ion in the solution is responsible for this colour change?

$\text{OH}^-$
$\text{H}^+$
$\text{Na}^+$
$\text{Cl}^-$

Loading problem…