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Radda [10]
3 years ago
13

HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of sol

ution. The pH of the solution was 4.93 at 25.0°C. What is the Ka of HZ?
Chemistry
1 answer:
dlinn [17]3 years ago
7 0

Answer: below is the calculation for Ka

Explanation:

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The indicator propyl red has a Ka of 3.3 X 10-6 . It is red at low pH and yellow at higher pH. What is the approximate pH range
Alik [6]

Answer:

4.48 - 6.48

Explanation:

A pH indicator works in a better way in a range of pH = pKa ± 1. That means we need to determine the pKa of the indicator propyl red to find the range over which it change its color. That is:

pKa = -log Ka

pKa = -log 3.3x10⁻⁶

pKa = 5.48

That means the range over propyl red will change from yellow to red or vice versa is:

4.48 - 6.48

5 0
2 years ago
What group is the element NITROGEN in? 1 Group 4<br> 2 Group 5<br> 3 Group 2<br> 4 Group 8
Butoxors [25]

Answer:

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3 0
3 years ago
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Which of the following describes a unique property of water that helps sustain marine life?
LUCKY_DIMON [66]

Answer:

B

Explanation:

Since ice is less dense than water, it floats. This forms an ice cover sheet in cold regions such as in the poles. This insulates the water beneath from excessive heat loss hence preventing it from turning into ice too, This protects the marine life beneath. Also, water does not gain heat or loss it rapidly (due to its high heat capacity) hence offering a more or stable temperature range for marine life.

6 0
3 years ago
What type of reaction takes place between propene and chlorine? Write down the chemical equation for this reaction.
sesenic [268]

Answer:

electrophilic addition

Explanation:

CH3 - CH = CH2 + Cl-Cl ---> CH3 -CH(Cl) - CH2(Cl)

4 0
3 years ago
A. Identify the steps of the scientific method?
Greeley [361]

Answer:

1, experimentary

2, high potassium

3, testes

4, consistent

5, wi-fi

6, yes, it's not good enough

7, possibility

8, because it's not effective

Explanation:

thanks me later

6 0
3 years ago
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