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kompoz [17]
2 years ago
14

What type of reaction is shown below? Ca + 2H2O - Ca(OH)2 + H2

Chemistry
1 answer:
krek1111 [17]2 years ago
5 0
A + BC  ---> AB + C
So here one reactant (A) is accepting a group which is being given by another compound (BC) however the A is not giving any group / element or ion
So this single displacement
Similarly in the given reaction
the anion OH- is only being replaced
The element Ca accepts OH- and H2O loses the same group to form new element H2
So the correct answer is
Single replacement also known as single displacement.
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The buffer of H₂PO₄⁻ / HPO₄²⁻ (Monobasic phosphate and dibasic phosphate has a pKa of 7.2

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pH = 7.2 + log [HPO₄⁻² ] / [H₂PO₄⁻]

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0.2 = log [0.2] / [H₂PO₄⁻]

1.58489 = [0.2] / [H₂PO₄⁻]

[H₂PO₄⁻] = 0.1262M

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