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
aev [14]
3 years ago
7

You notice that the water in your friend's swimming pool is cloudy and that the pool walls are discolored at the water line. A q

uick analysis reveals that the pH of the water is 8.40 when it should be 7.20. The pool is 7.00 m wide, 18.0 m long, and has an average depth of 1.50m What is the minimum (in the absence of any buffering capacity) volume (mL) of 12.0 wt% H2SO4 (SG 1.080) that should be added to return the pool to the desired pH? mL
Chemistry
1 answer:
kicyunya [14]3 years ago
5 0

Answer:

3,78 mL of 12,0wt% H₂SO₄

Explanation:

The equilibrium in water is:

H₂O (l) ⇄ H⁺ (aq) + OH⁻ (aq)

The initial concentration of [H⁺] is 10⁻⁸ M and final desired concentration is [H⁺] = 10^{-7,2}

Thus, you need to add:

[H⁺] = 10^{-7,2} - 10^{-8} = <em>5,31x10⁻⁸ M</em>

The total volume of the pool is:

7,00 m × 18,0 m ×1,50 m = 189 m³ ≡ 189000 L

Thus, moles of H⁺ you need to add are:

5,31x10⁻⁸ M × 189000 L = 1,00<em>x10⁻² moles of H⁺</em>

These moles comes from

H₂SO₄ → 2H⁺ +SO₄²⁻

Thus:

1,00x10⁻² moles of H⁺ × \frac{1 H_{2}SO_{4} moles}{2H^+ mole} = <em>5,00x10⁻³ moles of H₂SO₄</em>

These moles comes from:

5,00x10⁻³ moles of H₂SO₄ × \frac{98,1g}{1mol} × \frac{100 gsolution}{12 g H_{2}SO_{4} } × \frac{1mL}{1,080 g} = <em>3,78 mL of 12,0wt% H₂SO₄</em>

<em></em>

I hope it helps!

You might be interested in
Aluminum oxide (Al2O3) occurs in nature as a mineral called corundum, which is noted for its hardness and resis- tance to attack
Neko [114]

Answer:

7.03×10²³ atoms of Al

Explanation:

Corundum density = 3.97g/cm³

Corundum = Al₂O₃. Then, you have 2 moles of Al and 3 moles of O in 1 mol of the compound.

Let's determine the mass of corundum, by density

Corundum density = Corundum mass / Corundum volume

3.97 g/cm³ = Corundum mass / 15cm³

3.97 g/cm³ . 15cm³ = Corundum mass →59.55 g

Now, let's find out how many moles are in that mass of corundum

1 mol of Al₂O₃ weighs 101.96 g/mol

Then, 101.96 grams of oxide have 2 moles of Al

59.55 g of oxide, will have (59.55  .2)/101.96 = 1.17 moles

Now, we can know the quantity of atoms, by this rule of three

1 mol has NA atoms (6.02×10²³)

1.17 moles will have (1.17  . NA) = 7.03×10²³ atoms of Al

5 0
2 years ago
For liquids, which of the following factors affect vapor pressure? Check all that apply: volume temperature
In-s [12.5K]
I believe the correct answer from the choices listed above is the second option. For liquids, it is the temperature that affects vapor pressure. <span>The </span>vapor pressure<span> of any substance increases non-linearly with </span>temperature<span> according to the Clausius–Clapeyron </span>relation<span>. Hope this helps. Have a nice day.</span>
5 0
3 years ago
Write balanced molecular equation for the reaction between nitric acid and calcium hydroxide. Express your answer as a chemical
Alisiya [41]

Answer:

2HNO3 + Ca(OH)2 ===> Ca(NO3)2 + 2H2O

Explanation:

This a neutralisation reaction. The first thing to note is that this type of reaction forms salt and water.

Note that the formula of water is H2O. So write this at the right hand side.

                                    ==> H2O

Next note that the salt should contain the acid radical (NO3) and the metallic part of the base (Ca) written well following the rule for writing chemical equation; thus

                            ==> Ca(NO3)2 + H2O

The next step is to write the reactants at the right hand side of the equation;

HNO3 + Ca(OH)2 ==> Ca(NO3)2 + H2O

The final step is to count the number of atoms in each side of the equation to make sure they are equal and balanced.

In the above equation, H atoms are three at the left hand side add 2 to to H- containig compound on both side as to balance up. Thus

2HNO3 + Ca(OH)2 ===> Ca(NO3)2 + 2H2O

The equation 2HNO3 + Ca(OH)2 ===> Ca(NO3)2 + 2H2O is balance.

4 0
2 years ago
How many grams of hydrogen are in 46 g of CH40?<br>​
Romashka [77]

Answer:

5.8 grams of hydrogen

Explanation:

Your welcome

6 0
2 years ago
Read 2 more answers
Earth has several ideal features which enable it to support life. MOST important is the
MakcuM [25]
I think the most important is D
7 0
2 years ago
Read 2 more answers
Other questions:
  • How much mass does 0.1 mole of neon contain
    11·2 answers
  • What are chemical properties of ionic compounds
    15·1 answer
  • What is the universal solvent?<br><br> A:oil<br><br> B:acid<br><br> C:water<br><br> D:hydrogen
    9·2 answers
  • Which of these is a property of acids?
    11·2 answers
  • How is the energy of an object affected after work is done on it?
    14·1 answer
  • Sunspots appear dark because they are what ?
    11·1 answer
  • The climate of the continental United States is generally
    12·1 answer
  • For the reaction co(g)+h2o(g)⇌h2(g)+co2(g), k= 4.24 at 800 k what can be said about this reaction at this temperature?
    11·2 answers
  • What does a bi-directional arrow tell you about a chemical reaction?
    7·1 answer
  • Can someone plz help Me? :(
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!