Question

7. A solution of sodium carbonate has ph around 13. the nature of the solution is ( strongly acidic, weakly acidic, strongly alkaline, weakly alkaline )

Answer 1

Answer:

strongly alkaline..is the right answer

Answer 2

The nature of the sodium carbonate solution having a pH of around 13 is strongly alkaline.

• The pH value of a solution can be said to be the measure of the concentration of the hydronium ion in the solution. The pH value is the negative base 10 logarithm of the hydronium ion concentration.

                                             ∴ pH = -log₁₀[H⁺]

• Depending upon the value of pH, a solution can be acidic, neutral, or alkaline. If the temperature is around 25°C then:

1. A solution with a value of pH less than 7 is acidic in nature. Here the H⁺ ion concentration is greater than the OH⁻ ion concentration.
2. A solution with a value of pH around 7 is neutral in nature. Here the concentrations of the H⁺ ions and OH⁻ ions are almost equivalent.
3. A solution with a value of pH greater than 7 is alkaline in nature. Here the OH⁻ ion concentration is greater than the H⁺ ion concentration.

• Since in the given question the pH of the sodium carbonate solution is around 13 which is much greater than 7, hence it is strongly alkaline.

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