Question

pH of an aqueous solution containing NaOH is 12. The weight of NaOH present
in 100ml of that solution in grams is​

Answer 1

Answer:

Molar mass of NaOH is 40.

4 g in 100 mL means it is 4/40g i.e. 0.1 mol in 100mL or 1 mol per litre.

Since NaOH is a strong electrolyte it undergoes 100% dissociation. So concentration of OH (-) is 1 mol/ litre.

pOH = - log [ OH-] i.e. -log 1 = 0.

pH = 14- pOH = 14 at 298 K.

For the solution while calculating pH one has to consider only concentration in moles per litre.p H is independent of volume .Thus 10 mL also will have one & the same pH.

Explanation:

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Answer 2

Answer:

No of moles =1/40 =.025 Molarity = moles /volume of solution %3D =.025/1 =.25 molar solution