Name: pH Scale
Uploaded: 2019-07-19
Duration: 9 min 45 s
Description: This video discusses the pH of acids, bases, and salts and also the limitations of using a pH scale for identification. The natural indicators do the verific...

Question

Complete the following table:

S.No.	Test Solution	Indicator that can be used	Initial colour of the test solution	Final colour of the test solution
1	Lemon juice	Blue litmus	Colourless	Red
2	Vinegar		Colourless
3	Milk of magnesia	Phenolphthalein	White
4	Soda water			Red
5	Baking soda solution		Colourless	Blue
6	Orange juice	Blue litmus	Orange
7	Soap solution		Colourless	Magenta
8	Shampoo (dilute)	Turmeric solution	Colourless

Accepted Answer

S.No. Test Solution Indicator that can be used Initial colour of the test solution Final colour of the test solution

1 Lemon juice Blue litmus Colourless Red

2 Vinegar Blue litmus Colourless Red

3 Milk of magnesia Phenolphthalein White Magenta

4 Soda water Blue litmus Colourless Red

5 Baking soda solution Red litmus Colourless Blue

6 Orange juice Blue litmus Orange Red

7 Soap solution Phenolphthalein Colourless Magenta

8 Shampoo (dilute) Turmeric solution Colourless Red

Turmeric solution, litmus solution, red cabbage extract and china rose extract are some natural indicators. Phenolphthalein and methyl orange are some synthetic indicators. Litmus solution turns red in acidic medium and turns blue in basic medium. Phenolphthalein is colourless in acidic and neutral medium and turns magenta in basic medium. Yellow turmeric solution turns to brick red in basic medium.

Important Questions on Acids, Bases and Salts

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