Question

What is effect of dilute hydrochloric acid in blue litmus methyl orange phenolphthalein red litmus

Answer 1

1.It turns blue litmus to red.
2.It turns methyl orange's color into yellow.
3.It impacts no change to the color of phenolphthalein, i.e it remains colorless.
4.No change in the color of red litmus.

Answer 2

Dilute hydrochloric acid turn blue litmus red since the presence of acids change the color of blue litmus.

EXPLANATION:

Methyl orange indicator turns reddish pink because of the action of dilute HCl. Methyl orange turn pink coloured in acidic solutions and yellow coloured in basic solutions.

Phenolphthalein indicator will remain 'colourless' by the action of HCl. The phenolphthalein indicator is colourless in acidic mediums while it turns to 'pink colour' in basic solutions.  

The red litmus paper remains as such and there is no change of colour in red litmus when HCl acts on it.