Question

You are asked to make the given caustic soda solution into neither acidic nor basic. What would you do?

Please answer as fast u understood and please don't answer if u don't know ​

Answer 1

Answer:

Activity

Fill one fourth of a test tube with dilute hydrochloric acid. Note down its colour. Note down the colour of phenolphthalein solution also. Add 2-3 drops of t he indicator to the acid. Now shake the test tube gently. Add to the acidic solution a drop of sodium hydroxide solution by a dropper. Stir the tube gently. Continue adding the sodium hydroxide solution drop by drop while stirring till the pink colour just appears.

Now add one more drop of dilute hydrochloric acid. The solution again becomes colourless. Again add one drop of sodium hydroxide solution. The solution again becomes pink in colour.It is evident that when the solution is basic, phenolphthalein gives a pink colour. On the other hand, when the solution is acidic, it remains colourless.

When an acidic solution is mixed with a basic solution, both the solutions neutralise the effect of each other. When an acid solution and a base solution are mixed in suitable amounts, both the acidic nature of the acid and the basic nature of the base are destroyed. The resulting solution is neither acidic nor basic. Touch the test tube immediately a fter neutralisation . In neutralisation reaction, heat is always produced, or evolved. The evolved heat raises the temperature of the reaction mixture.

In neutralisation reaction a new substance is formed. This is called salt. Salt may be acidic, basic or neutral in nature. Thus, neutralisation can be defined as follows:

The reaction between an acid and a base is known as neutralisation. Salt and water are produced in this process with the evolution of heat.

Acid + Base --------------> Salt + Water (Heat is evolved)

The following reaction is an example: Hydrochloric acid (HCl ) + Sodium hydroxide (NaOH)

Sodium chloride ( Na Cl + Water( H2O )