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Paladinen [302]
3 years ago
7

Calculate the pH of a 0.010 M NaNO2 solution.

Chemistry
1 answer:
ryzh [129]3 years ago
3 0

Answer:

Calculate the pH of 0.010 M HNO2 solution. The K, for HNO2 is 4.6 x 104

Answer: pH = 2.72

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Explain why vigorous exercise causes the heart rate to increase and you to also breathe faster.
patriot [66]

Answer:

When you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.

Explanation:

3 0
3 years ago
Classify each of the following as an exothermic or endothermic reaction:
serious [3.7K]
<h3><u>Answer;</u></h3>

1) 2H2(g)+O2(g)⟶Δ2H2O(g)+483.6kJ  - Exothermic

2) 6CO2(g)+6H2O(l)+15000kJ⟶C6H12O6(aq)+6O2(g)  - Exothermic

3) 2Al(s)+Fe2O3(s)⟶Al2O3(s)+2Fe(s)+850kJ - Exothermic

<h3><u>Explanation</u>;</h3>
  • Exothermic Reaction is a chemical reaction in which heat is given out is known as exothermic reaction, while, and endothermic Reaction is a chemical reaction in which heat energy is absorbed is known as endothermic reaction.
  • The reaction between carbon dioxide and water is an example of an exothermic reaction. When most gases dissolve in solution, the process is exothermic meaning that heat is released as the gas dissolves
  • The reduction of ferric oxide by aluminium is highly exothermic and therefore the iron formed will be in the molten state.
6 0
4 years ago
Which of the following is not an example of a renewable resource?
Mazyrski [523]

Answer:

The answer is C. Coil

Explanation:

Water is a renewable resource. So is sunlight. Coil is not. I know because it is a fossil fuel. Coil takes millions of years to form in the earth. Therefore, it is not a renewable resource.

5 0
3 years ago
Read 2 more answers
a 20 liter sample of gas is kept under a constant pressure of 100 kpa. the temperature is lowered from 360 k to 90 k. what is th
Setler79 [48]

To solve this we assume that the gas inside the balloon is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant pressure and number of moles of the gas the ratio T/V is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

T1 / V1 = T2 / V2

V2 = T2 x V1 / T1

V2 =90 x 20 / 360

<span>V2 = 5 L</span>

3 0
4 years ago
A 25.00-mL sample of propionic acid, HC3H5O2, of unknown concentration was titrated with 0.141 M KOH. The equivalence point was
Nastasia [14]

Answer:

Concentration of hydroxide-ion at equivalence point = 8.3\times 10^{-6}M

Explanation:

HC_{3}H_{5}O_{2}+KOH\rightarrow C_{3}H_{5}O_{2}^{-}K^{+}+H_{2}O

1 mol of HC_{3}H_{5}O_{2} reacts with 1 mol of KOH to produce 1 mol of C_{3}H_{5}O_{2}^{-}

At equivalence point, all HC_{3}H_{5}O_{2} gets converted to C_{3}H_{5}O_{2}^{-}.

Moles of C_{3}H_{5}O_{2}^{-} produced at equivalence point is equal to moles of KOH added to reach equivalence point.

So, moles of C_{3}H_{5}O_{2}^{-} produced = \frac{43.76\times 0.141}{1000}moles=0.00617moles

Total volume of solution at equivalence point = (25.00+43.76) mL = 68.76 mL

Concentration of C_{3}H_{5}O_{2}^{-} at equivalence point = \frac{0.00617\times 1000}{68.76}M=0.0897M

OH^{-} produced at equivalence point is due to hydrolysis of C_{3}H_{5}O_{2}^{-}. We have to construct an ICE table to calculate concentration of OH^{-} at equivalence point.

C_{3}H_{5}O_{}^{-}+H_{2}O\rightleftharpoons HC_{3}H_{5}O_{2}+OH^{-}

I:0.0897                               0                    0

C: -x                                     +x                   +x

E: 0.0897-x                          x                      x

\frac{[HC_{3}H_{5}O_{2}][OH^{-}]}{[C_{3}H_{5}O_{2}^{-}]}=K_{b}(C_{3}H_{5}O_{2}^{-})=\frac{10^{-14}}{K_{a}(HC_{3}H_{5}O_{2})}

species inside third bracket represent equilibrium concentrations

So, \frac{x^{2}}{0.0897-x}=7.69\times 10^{-10}

or, x^{2}+(7.69\times 10^{-10}\times x)-(6.90\times 10^{-11})=0

So, x=\frac{-(7.69\times 10^{-10})+\sqrt{(7.69\times 10^{-10})^{2}+(4\times 6.90\times 10^{-11})}}{2}M = 8.3\times 10^{-6}M

So, concentration of hydroxide-ion at equivalence point = x M =  8.3\times 10^{-6}M

8 0
3 years ago
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