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Usimov [2.4K]
3 years ago
6

What vitamin is produced by a mammalian skin?

Chemistry
1 answer:
Contact [7]3 years ago
7 0
It is Vitamin D, hope that helps
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As a technician in a large pharmaceutical research firm, you need to produce 250. mL of a potassium dihydrogen phosphate buffer
Reika [66]

Answer:

We will need 147.772 mL of KH2PO4 to make this solution

Explanation:

For this case we can give the following equation:

H2PO4 - ⇄ H+ + HPO42-

With following pH- equation:

pH = pKa + log [HPO42-]/[H2PO4-]

7.05 = 7.21 + log [HPO42-]/[H2PO4-]

-0.16 =  log [HPO42-]/[H2PO4-]

10^-0.16 = [HPO42-]/[H2PO4-]

0.6918 = [HPO42-]/[H2PO4-]

Let's say the volume of HPO42-= x  then the volume of H2PO4- will be 250 mL - x

Since both have a concentration of 1M = 1 mol /L

If we plug this in the equation 0.6918 = [HPO42-]/[H2PO4-]

0.6918 = x / (250 - x)

0.6918*250 - 0.6918x = x

172.95 = 1.6918x

x = 102.228 mL

The volume of HPO42- = 102.228 mL

Then the volume of H2PO4- = 250 - 102.228 = 147.772 mL

To control this we can plug this in the pH equation

7.05 = 7.21 + log [HPO42-]/[H2PO4-]

7.05= 7.21 + log (102.228 / 147.772) = 7.05

We will need 147.772 mL of KH2PO4 to make this solution

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3 years ago
Propose a 3-step reaction for the conversion of cyclopentene to propanedioic acid
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I
don't know because this is the question which I never heard

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A flexible container holds 32.4L of gas at 55.0c. What will be the volume if the temperature falls to 17.0c
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The answer will be 25.92 L for 17.0 c
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What do two or more atoms form when they share electrons in a chemical bond
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A covalent bond is your answer
6 0
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Read 2 more answers
Can someone help me with #35,37,39,41 please
adoni [48]
35 b.
37 h
39 i
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hope that helps
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3 years ago
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