1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marat540 [252]
3 years ago
5

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 9.2. What should s

he do to correct this situation?
A. Add water.

B. Add base.

C. Add acid.

D. Do nothing.
Chemistry
2 answers:
aksik [14]3 years ago
8 0

Answer : The correct option is, (C) Add acid.

Explanation :

As we know that, the pH measures the acidity and basicity of a substance.

The pH range for acidic solution is, 0.1 to 6.9

The pH range for basic solution is, 7.1 to 14

For neutral solution the pH is, 7

As per question, the worker wants the pH of the swimming pool is, 7.2 that means slightly basic. But by testing the water, she found that the pH is, 9.2 that means highly basic. So, to correct the pH of swimming pool that is 7.2 she should add an acid into the water to overcome the basicity of the water.

Hence, the correct option is, (C) Add acid.

cestrela7 [59]3 years ago
7 0

Answer:

The correct answer is option C.

Explanation:

The pH of the solution is negative logarithm of hydrogen ion concentration in the aqueous solution.

pH=-\log[H^+]

  • Higher the hydrogen ion concentration lower will be the pH.Hence, acidic
  • Lower the hydrogen ion concentration higher will be the pH.Hence, alkaline.

The pH of the pool = 9.2

9.2=-\log[H^+]

[H^+]=6.3096\times 10^{-10} M

The pH of the pool desired by worker = 7.2

7.2=-\log[H^+]'

[H^+]'=6.3096\times 10^{-8} M

Hydrogen ion needed tom vahnge pH of the pool from 9.2 to 7.2 is

:[H^+]'-[H^+]=6.3096\times 10^{-8} M-6.3096\times 10^{-10} M

=6.2465\times 10^{-8} M

For hydrogen ions worker has to add acid which will give hydrogen ion in its aqueous from. Hence, correct answer is option C.

You might be interested in
A mixture of hydrogen and argon gases is maintained in a 6.47 L flask at a pressure of 3.43 atm and a temperature of 85 °C. If t
11Alexandr11 [23.1K]

Answer:

The mixture contains 8.23 g of Ar

Explanation:

Let's solve this with the Ideal Gases Law

Total pressure of a mixture = (Total moles . R . T) / V

We convert T° from °C to K → 85°C + 273 = 358K

3.43 atm = (Moles . 0.082 L.atm/mol.K . 358K) / 6.47L

(3.43 atm . 6.47L) / (0.082 L.atm/mol.K . 358K) = Moles

0.756= Total moles from the mixture

Moles of Ar + Moles of H₂ = 0.756 moles

Moles of Ar + 1.10 g / 2g/mol = 0.756 moles

Moles of Ar = 0.756 moles - 0.55 moles H₂ → 0.206

We convert the moles to g → 0.206 mol . 39.95 g / 1 mol = 8.23 g

8 0
3 years ago
Read 2 more answers
What is the value of x in the measure of the angle?
Andrew [12]
The two angles would be both 41 degrees.
(2x  + 13) = 41 \\ 2x = 41 - 13 \\ 2x = 28 \\ x =  \frac{28}{2} \\ x = 14
x in this case would be 14 degrees.
4 0
3 years ago
Read 2 more answers
You have at your disposal 3 1-pound bags of various pure salts that dissolve readily in water. You can add one of the bags to a
Sedaia [141]

Answer:

This question appears incomplete

Explanation:

However, it should be noted that addition of soluble salts generally lowers the freezing point of water hence after the addition, water will no longer freeze at 0°C but lower.

Soluble salts tend to form more ions in water, it is these ions that are responsible for interfering with the hydrogen bonds hence lowering the freezing. Thus, (since each bag are of the same weight) <u>the bag that contains the salt that ionizes more in water will lower the freezing point by the greatest amount</u>.

NOTE: Different weight of the salts could lead to more ions been formed in the water by some salts as against the other.

6 0
3 years ago
Tin(ii) fluoride (snf2) is often added to toothpaste as an ingredient to prevent tooth decay. what is the mass of f in grams in
a_sh-v [17]
From the periodic table:
molar mass of Sn = 118.71 grams
molar mass of F = 18.99 grams

This means that:
molar mass of SnF2 = 118.71 + 2(18.99) = 156.69 grams

Therefore, 156.69 grams of SnF2 contains 37.98 grams of F. To know the amount of F in 36.5 grams of the compound, we will simply do a cross multiplication as follows:
mass of F = (36.6 x 37.98) / 156.69 = 8.847 grams
3 0
3 years ago
Adding luminol to water creates a physical or chemical change ​
faust18 [17]
Answer: chemical

not 100% sure
7 0
3 years ago
Read 2 more answers
Other questions:
  • Which has the greater density? air at sea level air or at 20 km altitude?
    9·2 answers
  • In the lab vinegar acetic acid was mixed with baking soda sodium bicarbonate to form dioxide gas and sodium acetate. What are th
    5·1 answer
  • What is the definition for exothermic and endothermic energy?
    5·1 answer
  • Why is second ionization energy larger than first ionization energy
    9·2 answers
  • A reaction mixture that consisted of 0.35 molH2and 1.6 mol I2 was introduced into a 2 L flask and heated. At the equilibrium, 60
    10·1 answer
  • X-rays with a wavelength of 8.82 nm. Calculate the frequency of the x rays
    7·1 answer
  • What is constant speed?
    5·2 answers
  • A non polar solute will most likely dissolve in a polar solvent because opposites attract. Select one: True False
    10·1 answer
  • Help with science----?????///
    15·1 answer
  • Oxygen difluoride is a hazardous, highly explosive gas used as a propellant. A sample of this compound weighing 0.432 grams is a
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!