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Liono4ka [1.6K]
3 years ago
5

Jamal was riding his bike home at a speed of 12 mph. On his trip out, he had traveled 8 miles away from his house. He has been t

raveling for a half hour at this speed.
How far away from home is he?

2
3
4
Chemistry
2 answers:
trapecia [35]3 years ago
4 0
The answer is 2 because if he is going at 12mph that he is going 6mph in 30min. So 8-6=2
Bas_tet [7]3 years ago
3 0

Answer:

2

Explanation:

Speed of Jamal’s bike travelling back home = 12 mph

Time taken by Jamal to travel back home = 0.5 hr

Speed = distance / time  

Distance traveled by Jamal towards his home = speed x time = 12 mph x 0.5 h = 6 miles

Distance traveled by Jamal from his home = 8 miles

On his way back Jamal is 2 miles away from his home.  

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For 1. 00 l of an aqueous buffer containing 60. 0 mmol of acetic acid (pa=4. 76) and 40. 0 mmol of acetate, the pH of this buffer is 4.58.

<h3>What is handerson Hasselbalch equation? </h3>

It is expressed as:

pH = pKa + log [A-]/[HA]

where,

[A-] is the molar concentration of conjugate base

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Given,

pKa = 4.76

<h3>Calculation of concentration:</h3>
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C = n/V

= 60/1000

= 0.06M

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C = 40/1000

= 0.04M

Now, substituting values in equation we get,

pH = 4.76 + log(0.04/0.06)

pH = 4.76 + (-0.176)

pH = 4.58

Thus by using Henderson Hasselbalch equation we find the value of pH of the buffer is 4.58.

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As per the question ,the pH of coffee is 5.6 and we need to find the concentration of proton so putting the values in the above equation, we get

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