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Aleks04 [339]
3 years ago
11

Question 4 (1 point)

Chemistry
1 answer:
wlad13 [49]3 years ago
4 0
The answer would be A
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What is the average speed of the car after 3 seconds
True [87]

Answer:

depends on the car lol

Explanation:

8 0
3 years ago
You wish to prepare an HC2H3O2 buffer with a pH of 4.24. If the pKa of is 4.74, what ratio of C2H3O2 /HC2H3O2 must you use?
LenaWriter [7]

To solve this problem, we can use the Henderson-Hasselbalch Equation which relates the pH to the measure of acidity pKa. The equation is given as:<span>

<span>pH = pKa + log ([base]/[acid])                ---> 1</span></span>

Where,

[base] = concentration of C2H3O2 in molarity or moles

<span>[acid] = concentration of  HC2H3O2 in molarity or moles</span>

 

For the sake of easy calculation, let us assume that:

[base] = 1

[acid] = x

<span>
Therefore using equation 1,
4.24 = 4.74 + log (1 / x) 

<span>log (1 / x) = - 0.5

1 / x = 0.6065 </span></span>

x = 1.65<span>

The required ratio of C2H3O2 /HC2H3O2 <span>is 1:1.65 or 3:5. </span></span>
3 0
3 years ago
What is the mass of air in room
tigry1 [53]

Answer:

the mass of the air in the room is 4.96512 kg ( in 0°C)

3 0
2 years ago
Identify each definition that applies to the compound in red. Check all that apply.
Anastasy [175]

Answer:

Arrhenius base & Bronsted-Lowry base

6 0
3 years ago
Read 2 more answers
Specify which indicator or indicators you would use for the following titrations:
Helen [10]

Answer:

1. Phenolphthalein

2. Phenolphthalein

3. Methyl orange

Explanation:

Different indicators are used by knowing the relative strength of the acid and the bases I.e whether the acid is strong or weak, so also the base.

The following answers are obtainable:

1. Phenolphthalein

We use this indicator for a weak base and a strong acid. Formic acid is a weak organic acid while sodium hydroxide is a strong base

2. Phenolphthalein

We use this indicator because we are dealing with a strong acid and a strong base. Hydrochloric acid is a strong acid while potassium hydroxide is a strong base

3. Methyl orange

This is because we are dealing with a strong acid and a weak base

5 0
3 years ago
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