Chemistry, asked by Parthasaha9438, 1 year ago

How can we prepare blue litmus solution and red litmus solution?

Answers

Answered by balajeevish
7
1. Part 1: Making Litmus Solution
a. Put 3 cm water in a test tube (Notice the meniscus, the curve in the surface of the water. Measure from the bottom of the meniscus).
b. Put 3 small spoonfuls of litmus powder into the test tube. It should be a dark blue/black color.
c. Cap the test tube, put thumb over the top and shake away from your face.
d. Let sit 24 hours.
2. Part 2: Making Litmus Solution
a. Pour liquid into bottle, keeping the solids in the test tube (It is hard to see the difference between the liquids and solids, so go slow). This is your litmus solution. Dispose of the sludge in the trash.
b. Add ½ pipette of denatured alcohol to improve the shelf life of your litmus solution. When measuring, the alcohol should come halfway into the bulb section. Cap alcohol and put out of reach.
c. Add the following to test tube #1: 5 cm distilled water + 1 spoon tip (½ of the small spoon) sodium carbonate (NaCO3). Cap chemical and put aside. Cap test tube and shake to mix. Now, add 5 drops litmus solution. Cap and shake. You should see a blue/purple color, which indicates a base.
d. Add the following to test tube #2: 1 small spoonful sodium hydrogen sulfate (NaHSO4).
e. Uncap test tube #1, and pour contents into test tube #2. You should see a red color, which indicates an acid.
f. Use your litmus solution to test other liquids. Add solution to liquids such as vinegar, lemon juice, orange juice, water + baking soda, baking soda + vinegar, and any other items you can think of to test!
g. To clean up, flush liquids down the sink with plenty of water. Wash test tubes as thoroughly as possible.
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