A blue litmus paper was first dipped in dil. Hcl and then in dil NaoH solution what can be observed?

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Solution

A blue litmus paper is dipped in dilute HCl solution, it will turn into red because of the acidic nature of HCl solution. Then it is dipped in dilute NaOH solution , the colour of the litmus paper will now depend on the concentration of the NaOH. If the concentration of NaOH solution is higher than the concentration of HCl solution, then litmus paper will again turn into blue and if the concentration of NaOH solution is less than the concentration of HCl solution , then the colour of the litmus paper will fade but remain red.

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Q. A blue litmus paper was first dipped in dilute HCl and then in dilute NaOH solution. What was observed in the colour of the litmus paper?

Q. When a blue litmus paper is dipped in a solution, it remains blue. What can be concluded about this solution?

When drops of blue litmus solutions are added to dil. HCl and aqueous NaOH taken in two different test tubes A and B respectively, what will be the colour changes occurring?

When blue litmus paper was dipped into the water, the colour of litmus paper remained the same. Similarly, when red litmus paper was dipped into water, the colour remained the same. By above observation we can concluded that:

What happens when [5 MARKS]

a) A red litmus paper is dipped in a solution of calcium hydroxide.

b) A red litmus paper is dipped in a solution of sodium chloride.

c) A blue litmus paper is dipped in lemon juice.

d) A red litmus paper is dipped in distilled water.

e) A solution of sodium hydroxide is added to turmeric.

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