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Darina [25.2K]
4 years ago
5

Which statement correctly describes the phosphate ion, PO4/3-?

Chemistry
2 answers:
sleet_krkn [62]4 years ago
8 0
I believe the correct answer from the choices listed above is the first option. Phosphate ion is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. Hope this answers the question. Have a nice day.
Vladimir [108]4 years ago
6 0

The correct answer is (a)


It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.


The explanation:


- the bond between oxygen and phosphorus is covalently.


when A covalent bond is a bond in which electrons are shared. \nd the ionic bond, electrons are completely transferred. In this case phosphate ion (PO4)-3 is covalent.


- that's means that the choice C and D don't be the correct answer.


-Additionally, since the charge is on the oxygen atoms due to the bonding with phosphorus, so we can say that the charge is on the entire ion and not just on the phosphorus atom so,the answer B also not the correct answer.


and the correct one is (A)



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Calculate the pH of a solution that is 2.00 M HF, 1.00 M NaOH, and 0.472 M NaF. (Ka=7,2×104)
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Explanation:

The given data is as follows.

Concentration of acid, [HF] = 2 M

Concentration of salt, [NaF] = 0.472 M

Concentration of base, [NaOH] = 1.00 M

K_{a} = 7.2 \times 10^{-4}

So, NaOH being a base will react with the acid that is, HF. And, according to Henderson-Hasselbalch equation we have he following.

             pH = pK_{a} + log\frac{[salt]}{[acid]}

Also, we known that pK_{a} = -log K_{a}

so,                     pK_{a} = -log 7.2 \times 10^{-4}

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