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shepuryov [24]
3 years ago
13

g A solid weak acid is weighed, dissolved in water and diluted to exactly 50.00 ml. 25.00 ml of the solution is taken out and is

titrated to a neutral endpoint with 0.10 M NaOH. The titrated portion is then mixed with the remaining untitrated portion and the pH of the mixture is measured. Mass of acid weighed out (grams) 0.771 Volume of NaOH required to reach endpoint: (ml) 18.17 pH of the mixture (half neutralized solution) 3.6 Calculate the following 1) What is the pKa of the acid
Chemistry
1 answer:
defon3 years ago
6 0

Answer:

pKa of the acid is 3.6

Explanation:

When a weak acid, HX, reacts with NaOH, the conjugate base, X⁻, is produced:

HX + NaOH → X⁻ + Na⁺ + H₂O

At the half neutralized solution, [HX] = [X-]

Based on Henderson-Hasselbalch equation:

pH = pKa + log [ X⁻] / [HX]

<em>Where pH is the pH of the buffer = 3.6</em>

<em>pKa is the pka of the solution</em>

<em>And as [ X⁻] = [HX], [ X⁻] / [HX] = 1</em>

<em />

Replacing:

3.6 = pKa + log 1

3.6 = pKa + 0

<h3>pKa of the acid is 3.6</h3>

<em />

<em />

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wariber [46]

Answer:

The reaction is endothermic

Explanation:

we know that the reactants had to get energy from its surroundings which means that the reaction is endothermic

7 0
3 years ago
Isopentyl acetate is the molecule largely responsible for the aroma and taste of bananas. It is made up of carbon, hydrogen, and
k0ka [10]

Answer:

Explanation:

7.706 g of CO₂ will contain 12 x 7.706 / 44 g of C

= 2.1 g of C .

This will be contained in 3.256 g of isopentyl acetate

3.156 g of H₂O will contain 2 x 3.156 / 18 g of H

= .351 g of H

This will be contained in 3.256 g of isopentyl acetate

Rest will be oxygen

amount of oxygen in 3.256 g of isopentyl acetate

= 3.256 - ( 2.1 + .351 )

= .805 g

ratio of C , H , O in isopentyl acetate

= 2.1 g : .351 g : .805 g

2.1 / 12 : .351 / 1 : 0.805 / 16 ratio of moles

= .175 : .351 : .05  ratio of moles

= 3.5 : 7.02: 1

= 7 : 14 : 2

empirical formula of  isopentyl acetate

= C₇ H₁₄ O₂ .

5 0
3 years ago
How much heat must absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s)?
Alex787 [66]

Answer:

about 4.8kJ

Explanation:

6 0
3 years ago
A mylar balloon is filled with helium gas to a pressure of 107 kPa when the temperature is 22°C. If the temperature changes to 4
brilliants [131]

Answer:

Explanation:

To solve this problem, we have to remember the ideal gas theory. We going to use the Gay Lussac Law.

The equation is:

PiTo = PoTi

Where:

<em>Pi =initial pressure</em>

<em>Po = final pressure</em>

<em>Ti = initial temperature</em>

<em>To = final temperature</em>

Let's use this equation and replace the values:

<em>Pi = 107 kPa</em>

<em>Ti = 22°C</em>

<em>To = 45 °C </em>

<em>Po = ? </em>

<em />

You can use the units as the problem gave you.

Using the Gay Lussac law:

107 kPa x 45 °C = Po x 22°C

Po = (4,815 kPa°C / 22°C) = 218.86 kPa

Po = 218 kPa

5 0
3 years ago
What is the correct way to write 1,550,000,000 in scientific notation?
OLga [1]
1.55 x 10^9
Just slide the decimal over to the left 9 times and this is what you will get.
6 0
4 years ago
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