Question

write a note on PH of solution​

Answer 1

Answer:

Ph is a measure of how acidic or basic is an aqueous solution. It is measured in terms of hydrogen ion concentration in the solution. The pH values range from 0 to 14. The values less than 7 represent an acidic solution, above 7 indicates a basic solution and 7 is neutral

Answer 2

Explanation:

IMPORTANCE OF PH -

• Our body works within the pH range of 7.0 to 7.8.
• Living organisms can survive only in a narrow range of pH change.
• When pH of rain-water is less than 5.6, it is called acid rain.
• When acid rain flows into the rivers, it lowers the pH of the river water.
• The survival of aquatic life in such rivers becomes difficult.

SYNTHETIC INDICATORS -

• Indicators that are synthesized in laboratory are known as synthetic indicators.
• For example: phenolphthalein, methyl orange, etc.

OLFACTORY INDICATORS -

• A substance whose smell varies depending on whether it is mixed with an acidic or basic solution is known as 'Olfactory indicator'.
• Such substances can be used in the laboratory to test whether a solution is a base or an acid, and this process is called olfactory Titration.
• Onion, Vanilla extract are common examples of Olafactory Indicators.

1.Onion:- Paste or juice of onion loses its smell when added with base.It does not change its smell with acid.

2.Vanilla:- The smell of vanilla vanishes with base, but its smell does not vanish with an acid.

PH SCALE -

Above the diagram

• Acidity and alkalinity are measured with a logarithmic scale called pH.
• The pH scale measures how acidic or basic a substance is the pH scale ranges from 0 to 14.
• A pH of 7 is neutral.
• A pH less than 7 is acidic.
• A pH greater than 7 is basic.
• The pH scale is logarithmic and hence, each whole pH value below 7 is ten times more acidic than the next higher value.
• For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6. The same holds true for pH values above 7, each of which is ten times more basic than the next lower whole value. For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8.

NATURAL INDICATORS -

• Indicators obtained from natural sources are called 'Natural Indicators'.
• The color of a natural acidbase indicator depends on pH.
• One of the most well known effects of natural indicators in plants occurs in the hydrangea or snowball plant.
• Hydrangea flowers are blue when grown in acidic soils and pink or red in basic soils.
• Other common examples of Natural indicators include Turmeric, Beetroot juice etc.

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