Question

$50mL$ $N/10$ $NaOH$ solution is mixed with $50mL$ $N/20$ $HCl$ solution. The resulting solution will:

• A. Turn phenolphthalein solution pink
• B. Turn blue litmus red
• C. Turn methyl orange red
• D. $\left[H^{+}\right]<{OH}^{-}$

Answer 1

Answer: (A), (D)

The correct options are
A Turn phenolphthalein solution pink
D $\left[H^{+}\right]<{OH}^{-}$

$NaOH+HCl\to NaCl+H_{2}O$

$5millimol$ $2.5millimol$

$2.5millimol$ $0$ $2.5millimol$

$NaCl$ is neutral in nature and $NaOH$ is strong base so solution is basic in nature and it turn phenolphthalien solution pink.

$Hph\to H^{+}+p{h}^{-}$

Colourless Pink

So when solution is alkaline in nature it turn colourless solution to pink.