Question

Indicate with the help of a diagram the variation of pH with change in concentration of H+(aq) and OH-(aq)ions

Answer 1

Hello sir,


I am feeling very happy to get this opportunity to help you out.

(¡)When H+ ion is added before a highly reactive non - metal radical oxide , it possesses a strong acid.

Examples :-

1) H2SO4, i.e., sulphuric acid Is such a acid formed from the interchange of valence charges of H+ and SO4 2- (sulphate) ion.

2)HF, i.e., Hydrofluoric acid, is the strongest and most unstable acid. It is formed by interchange of valence charges of H + and F- (fluoride ion where fluorine is the most electronegative substance).

(¡¡)When OH - ion is added after highly reactive metals according to the metal activity series, it forms a strong base.

Examples :-

1) NaOH, i.e.,Sodium hydroxide, is the strongest base which is formed by interchange of valence charges of OH - and Na + ions.

2) Ca (OH) 2, i.e., Calcium hydroxide, is formed by interchange of valence charges of OH - and Ca 2+ ions.


(¡¡¡) When weaker radicals react with H+ or OH - ions, they form weaker acids.

Examples :-

1) CH3COOH is vinegar or simply acetic acid. CH3COO - (acetate ion) interchanges its valence charge with H + ion to form a weak acid (acetic acid).

2)NH4OH, i.e., Ammonium hydroxide, is formed by interchange of NH4 + 's valency charge with OH - valency charges.It is a weak base.

[There is a attached photo here]


Hope it helps you sir.

Thanks for giving me opportunity and thanks for guiding us always.

Answer 2

Hello sir..

• First of all pH is basically stands for "potenz of hydrogen" here potenz mean power. It is useful and has it's own significance in testing whether a given solution is basic or acidic.

• So have a look on it's readings:-
This scale has readings 0 to 14 and every number indicates acidity or basicity-

• 0 to 6.9 - solution is acidic
As we start from 0 ( very acidic ) acidity keeps on decreasing upto 6.9 ( very low acidic). Acidity is directly proportional to concentration of H+ ions.
Examples: NaOH, KOH , etc.

• 7 - solution is neutral
This is the fixed number for a solution to be neutral .
Examples : H2O , etc.

• 7.1 to 14 - solution is basic
If reading comes out to be 7.1 than => solution is basic and as we go near to 14 basicity keeps on increasing. Basicity is directly proportional to concentration of OH- ions.



• Relation between pH and concentration of H+ ion:-

pH = -log [H+]

• One more important result we need to remember is:-


pH + pOH = 14


• One more thing we need to consider in case of dilute acid or base is the contribution of H+or OH- from water. As we have already known, at 25 oC water molecule could dissociate and H+ as well as OH- would form with the amount of 10−7 M each.

• Go through the attachment for diagramatic explaination.



Thank you
HOPE IT HELPS...


GLAD TO HELP YOU SIR.. :)
#Mme