Chemistry: What happens to water when it freezes? a) It expands. b) It forms vapor c) Its density increases. d) Its composition changes

D H2PO4– + HPO42–Explanation:The acid dissociation constant for are respectively.The reason while option D is the best answer is that, the value of pKa for both lies on either side of the desired pH of the buffer. This implies that one is slightly over and the other is slightly under.Using Henderson-Hasselbach equation:...

What happens to water when it freezes? a) It expands.

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hcortez4023

09.04.2021

Chemistry

no my brick in my pants is 20 inches tho

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nadine3782

08.10.2021

Chemistry

D H2PO4– + HPO42–

Explanation:

The acid dissociation constant for $\mathbf{H_3PO_4 , H_2PO^{-}_4 , HPO_4^{2-}}$ are $\mathbf{7\times 10^{-3}, \ \ 8\times 10^{-8} ,\ \ 5\times 10^{-13}}$ respectively.

$\mathbf{pka (H_3PO_4) = -log (7\times 10^{-3} )=2.2}$

$\mathbf{pka (H_2PO_4^-) = -log (8\times 10^{-8} )=7.1}$

$\mathbf{pka (HPO_4^{2-}) = -log (5\times 10^{-13} )=12.3}$

The reason while option D is the best answer is that, the value of pKa for both

$\mathbf{H_2PO^{-}_4 ,\ \& \ HPO_4^{2-}}$ lies on either side of the desired pH of the buffer. This implies that one is slightly over and the other is slightly under.

Using Henderson-Hasselbach equation:

$\mathbf{pH = pKa + log \Big( \dfrac{HPO_4^{2-}}{H_2PO_4^-} \Big)}$

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What happens to water when it freezes? a) It expands.
b) It forms vapor
c) Its density increases.
d) Its composition changes

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