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Dissociation of Acids in Water

State the val...

Question

State the valency of hydroxide ion.

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Solution

The hydroxide ion is OH, a compound made up of hydrogen and oxygen. Oxygen is a more electronegative atom as compared to hydrogen, thus the oxygen atom has a charge of -2 whereas the hydrogen atom has a charge of +1.
Thus ,OH has an overall charge of -1.

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Q. (a) What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions.
(b) The valencies (or charges) of some of the ions are given below :

Ion	Valency (Charge)	Ion	Valency (Charge)
Sodium ion	1+	Bromide ion	1–
Ammonium ion	1+	Hydroxide ion	1–
Calcium ion	2+	Sulphate ion	2–
Lead ion	2+	Phosphate ion	3–

Using this information, write down the formulae of the following compounds :
(i) Sodium phosphate
(ii) Ammonium sulphate
(iii) Calcium hydroxide
(iv) Lead bromide

Q. State the valency of
a) Sulphite
b) Nitrate
c) Hydroxide

State the valency of bromide ion.

How do we know the valency of a polyatomic ion? Such as hydroxide and many others.

State the valency of chloride ion.

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