Question

write any two method to test alkalis

Answer 1

INSTRUCTIONS:

Click a liquid to dip one end of both (blue and red) litmus paper into that liquid

Mouseout to dry the litmus paper

Use a NEW set of litmus paper for each liquid

••Blue Litmus Red Litmus

•Acids Neutral Alkalis

••liquid from car battery

••lemon juice

••vinegar

••acid rain

•« water »

••soapy water

••toothpaste

••baking soda solution

••bleach

LITMUS is a substance extracted from organisms called lichens; it is commonly used in chemistry to indicate whether a solution is acidic or alkaline. Litmus paper is blue or red, depending on which form of litmus is present.

When acidic solution is placed on litmus paper, the blue litmus will turn red while the red litmus will stay red. Alkalis turn red litmus blue while the blue litmus stays blue. Distilled water is neutral and will leave the litmus colour unchanged. Litmus paper is a rough acid-alkali indicator and not a precise measurement.

All acids are not of the same strength; some are strong and some are weak. There are also strong and weak alkalis. Scientists use the pH (potential of Hydrogen) scale with a range from 1 to 14 to indicate the strength of an acid or alkali.

Answer 2

Answer:

Explanation:

alkalis have a pH greater than 7.

Indicator change colors in different pH  

Litmus is one of the most common indicators.

Litmus turns red in an acidic solution.

Litmus turns blue in an alkali solution.

Blue litmus will stay blue in an alkali solution

Red litmus will turn blue in an alkali solution.