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Natali5045456 [20]
3 years ago
6

A swimming-pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 8.2. What should s

he do to correct this situation?
Chemistry
2 answers:
lianna [129]3 years ago
5 0

Answer: Add Acid

Explanation:

PtichkaEL [24]3 years ago
3 0
The pH of a solution is a measure of the acidity of a solution and is logarithmically related to the hydrogen ion concentration. It is expressed as:

pH = -log [H+]

We use this to determine the amount of H+ needed to adjust the pH to the desired value.

pH1 = 7.2 = -log [H+]
[H+] = 6.31x10^-8

pH2 = 8.2 = -log [H+]
[H+] = 6.31x10^-9

[H+] to be added =  6.31x10^-8 - 6.31x10^-9 = 5.68x10^-8 M

She should add an acidic solution with concentration 5.68x10^-8 M. Hope this helps.
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20.7g/mol

Explanation:

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According to the Law of Conservation of Mass, the total
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Always equal to the total moles of the products.

Explanation:

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Which of the following describes the greenhouse effect?
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D

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Explain the effects distance and mass have on the gravitational pull of the planets.
Slav-nsk [51]

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Gravity is normal...

Explanation:

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4 0
3 years ago
What is the frequency of a photon having an energy of 4.91 × 10–17 ? (c = 3.00 × 108 m/s, h = 6.63 × 10–34 J · s)​
AlexFokin [52]

Answer:

The frequency of the photon is 7.41*10¹⁶ Hz

Explanation:

Planck states that light is made up of photons, whose energy is directly proportional to the frequency of radiation, according to a constant of proportionality, h, which is called Planck's constant. This is expressed by:

E = h*v

where E is the energy, h the Planck constant (whose value is 6.63*10⁻³⁴ J.s) and v the frequency (Hz or s⁻¹).

So the frequency will be:

v=\frac{E}{h}

Being E= 4.91*10⁻¹⁷ J and replacing:

v=\frac{4.91*10^{-17} J}{6.63*10^{-34} J.s}

You can get:

v= 7.41*10¹⁶ \frac{1}{s}= 7.41*10¹⁶ Hz

<u><em>The frequency of the photon is 7.41*10¹⁶ Hz</em></u>

<u><em></em></u>

4 0
3 years ago
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