Classify the following into acid, base and amphiprotic species on the basis of protonic concept :
(i) H 2 PO 2 – (ii) H 2 PO 3 – (iii) H 2 PO 4 –
(iv) HPO 3 2– (v) HPO 4 2– (vi) NH 4 +
(vii) CH 3 COOH 2 +
Text Solution
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Acidic – (vi), (vii) ; Basic – (i), (iv) ; Amphiprotic – (ii), (iii), (v)
Sol. Acidic – NH 4 + , CH 3 COOH 2 + (can donate H + forming NH 3 & CH 3 COOH, cant accept H + due to existing positive charge).
Basic – H 2 PO 2 – , HPO 3 2– (can accept H + forming H 3 PO 2 and H 2 PO 3 – , but cannot donate H + as H is not directly attached to O, so non-acidic).
Amphiprotic – H 2 PO 3 – , H 2 PO 4 – , HPO 4 2– (can accept H + forming H 3 PO 3 , H 3 PO 4 and H 2 PO 4 – & can donate H + forming HPO 3 2– , HPO 4 2– & PO 4 3– respectively).
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