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Tju [1.3M]
3 years ago
5

Now take a fresh 60 mL of the 0.50 M pH 6.83 buffer and add 3.7 mL of 1.00 M NaOH. Using steps similar to those above, calculate

the new pH of the solution.
Chemistry
1 answer:
Digiron [165]3 years ago
4 0

Answer:

pH = pKa + log (33.7 mm / 26.3 mm)

Explanation:

Initial pH = 6.83

If we add a strong base, we expect that pH would be more alkaline

Initially we have: 60 mL . 0.50M =  30 mmoles of acid

Now, we add the base:

3.7 mL . 1.00 M = 3.7 mmmoles of base

Concentration of acid: 30 mmoles - 3.7 mmoles of base = 26.3 mm

Concentration of salt: 30 mmmoles + 3.7 mmoles of base = 33.7 mm

pH = pka + log (33.7 mm / 26.3 mm)

Information of pKa is missing

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24. The air in a small 250 cm birthday balloon is at a pressure of 760 torr. A boy sits on it at
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Answer:

1.14atm

Explanation:

Given parameters:

V1 = 250cm³ ;

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V2  = 220cm³ ; 0.22dm³

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Solution:

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       P1 V1 = P2V2

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                 P2  = 1.14atm

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Chlorine and potassium atoms form ionic bonds, carbon atoms form non-polar covalent bonds with nitrogen atoms, and oxygen forms
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Explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.

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Chlorine and potassium atoms form ionic bonds: Ionic bond is formed when there is complete transfer of electron from a highly electropositive metal to a highly electronegative non metal.  Electronegativity difference = electronegativity of chlorine - electronegativity of potassium = 3-0.8 = 2.2

Carbon atoms form non-polar covalent bonds with nitrogen atoms : Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms.  Electronegativity difference  = electronegativity of nitrogen  - electronegativity of carbon= 3.0-2.5 = 0.5

Oxygen forms polar covalent bonds with phosphorus: A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.  Electronegativity difference = electronegativity of oxygen - electronegativity of phosphorous = 3.5- 2.19 = 1.31

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A student placed equal volumes of honey and of water in two, identical, open dishes, and left them at room temperature for 8 hou
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A sample of nitrogen gas is at a temperature of 50 c and a pressure of 2 atm. If the volume of the sample remains constant and t
Lilit [14]

Answer:

The new temperature of the nitrogen gas is 516.8 K or 243.8 C.

Explanation:

Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

Gay-Lussac's law can be expressed mathematically as follows:

\frac{P}{T} =k

Where P = pressure, T = temperature, K = Constant

You want to study two different states, an initial state and a final state. You have a gas that is at a pressure P1 and at a temperature T1 at the beginning of the experiment. By varying the temperature to a new value T2, then the pressure will change to P2, and the following will be fulfilled:

\frac{P1}{T1} =\frac{P2}{T2}

In this case:

  • P1= 2 atm
  • T1= 50 C= 323 K (being 0 C= 273 K)
  • P2= 3.2 atm
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Replacing:

\frac{2 atm}{323 K} =\frac{3.2 atm}{T2}

Solving:

T2*\frac{2 atm}{323 K} =3.2 atm

T2=3.2 atm*\frac{323 K}{2 atm}

T2= 516.8 K= 243.8 C

<u><em>The new temperature of the nitrogen gas is 516.8 K or 243.8 C.</em></u>

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