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Properties of Water

53 A solution...

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53 A solution of an acid has pH =4.70.find out the number of OH- ions (pKw=14)

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Q. Assertion: A solution with

p H

of 12 has a higher concentration of hydroxide ions than one with a

p H

[H^{+}] [{O H}^{-}]

10^{- 14}

.

Q. A solution has a pH of

6.0

. What is the concentration of

O H^{-}

ions in the solution?

Q. Assertion :A basic solution has more hydrogen ions than an acidic solution. Reason: At

25^{o}

C, the product of

[H^{+}]

[O H^{-}]

10^{- 14}

.

Between pH value of 7 to 14, As pH increases:

Q. Strength of an acid solution or a basic solution can be determined by knowing the hydrogen ion concentrations in them, using a

p H

scale.
(i) Neutral solution has

p H

7.
(ii) Acidic solution has

p H

less than 7.
(iii) Basic solution has

p H

more than 7.
The

p H

of a solution is inversely proportional to hydrogen

(H^{+})

ion concentration in it.

Five students Ankit, Nitin, Deepika, Gunjan and Pooja were given test tubes having solutions with

p H

1.2, 13.5, 10.0, 7.4 and 2.2 respectively. The correct order of decreasing

O H^{-}

ions concentration in these solutions is:

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