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arrange the following acids in the order of increasing acidity. H 3 PO 3 ,H 3 PO 2 ,H 3 PO 4
Dear Govindaraj, Here, the O atoms draw electrons away from Z atom and make it more positive. The Z atom, therefore, becomes more effective in withdrawing electron density. In turn, electrons of the H – O bond are drawn more strongly away from the H atom. The net effect makes it easier for the proton to dissociate and increases the acidity of the compound. With more number of 0 atoms bonded to Z, the compound becomes a stronger acid. The acid strength is also explained by the oxidation number of central atom ( here P ) H3PO2 - +1 H3PO3 - +3 H3PO4 - +5 The acid strength is also explained by counting the number of oxygen atoms bonded to P hence order of acidity is : H3PO4 > H3PO3 >H3PO2 Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation. All the best. Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian. Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar respectively : Click here to download the toolbar.. Askiitians Expert Anil Pannikar IIT Bombay
Dear Govindaraj,
Here, the O atoms draw electrons away from Z atom and make it more positive. The Z atom, therefore, becomes more effective in withdrawing electron density. In turn, electrons of the H – O bond are drawn more strongly away from the H atom. The net effect makes it easier for the proton to dissociate and increases the acidity of the compound. With more number of 0 atoms bonded to Z, the compound becomes a stronger acid.
The acid strength is also explained by the oxidation number of central atom ( here P )
H3PO2 - +1
H3PO3 - +3
H3PO4 - +5
The acid strength is also explained by counting the number of oxygen atoms bonded to P
hence order of acidity is : H3PO4 > H3PO3 >H3PO2
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Anil Pannikar
IIT Bombay
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