question_answer

100 mL of HCl + 35 mL of NaOH, colour of methyl orange in the solution will be

A)  red                                       

B)  yellow

C)  can't be predicted

D)  methyl orange is not a suitable indicator

Correct Answer: A

Solution :

                 When 100 mL HCl is added to 35 mL NaOH, 35 mL is utilised to neutralise NaOH, while 65 mL HCl remains as such. Hence, the solution becomes acidic. In acid solution, the colour of methyl orange (indicator) is red due to presence of Me+ ions as