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Chemistry HElp?

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Predict whether the dipotassium salt of citric acid (K2HC6H5O7) will form an acidic or basic soluDon in water.

(Ka1 =7.4x10-4;Ka2 =1.7x10-5;Ka3 =4.0x10-7

 

asked Apr 8, 2015 in CHEMISTRY by heather Apprentice

1 Answer

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Step 1:

The acid dissociation constant for critic acid are image and image.

The constant for dissociation of the first proton may be denoted as image.

The constant for dissociation of the second proton may be denoted as image.

The constant for dissociation of the third proton may be denoted as image.

Find whether reaction of dipotassium salt of citric acid with water dissociates how many proton.

Chemical equation :

image.

Here citric acid dissociates a first proton.

Hence image.

image

The ratio image is constant, hence pH depends on the value of ka.

The higher value of ka, the solution will be more acidic.

image is the highest value among the three.

Hence the reaction of dipotassium salt of citric acid with water dissociates is acidic in nature.

Solution:

The reaction of dipotassium salt of citric acid with water dissociates is acidic in nature.

answered Apr 9, 2015 by Lucy Mentor

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