Question

calculate the ph where hydrogen ion concentration of solution is(i) 1×10-7 gram /ion ii) 4×10-6 gram /ion iii) 8×10-12 gram /ion​

Answer 1

Explanation ⇒

By the definition of pH,

pH = -log[H⁺]

(i).  [H⁺] = 10⁻⁷

Thus, pH = -log[10⁻⁷]

= 7log10

= 7

(ii). [H⁺]  = 4 × 10⁻⁶

pH = -log[H⁺]

= - log[4] - log[10⁻⁶]

= 6 - 2log2

= 6 - 2 × 0.3010

= 6 - 0.6020

= 5.398

(iii). [H⁺] = 8 × 10⁻¹²

Now, pH = -log[8 × 10⁻¹²]

= -log8 + 12log10

= 12 - 3log2

= 12 - 3 × 0.3010

= 12 - 0.9030

= 11.097

Hope it helps.

Answer 2

Answer:

pH helps to measure how a chemical solution is acidic or basic where its normal range varies from 0 to 14. [pH=7 for neutral, >7= acidic and <7 = basic ]

Formula to calculate pH is

pH = -log[H⁺]

This means pH is the negative base 10 logarithm of the hydrogen ion concentration of a solution.  

So, you have to simply put given values of hydrogen ion concentration [H⁺] into given formula.