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Reil [10]
3 years ago
10

Did I do this science worksheet correctly? Asking for a friend

Chemistry
1 answer:
grin007 [14]3 years ago
8 0

Yes everything looks good to me

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A beaker with 1.80×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and c
tekilochka [14]

Answer:

The pH change in 0,206 units

Explanation:

When the acetic acid buffer is at pH 5,000; it is possible to obtain the acetate/acetic acid proportions using Henderson-Hasselbalch formula, thus:

pH = pka + log₁₀ [A⁻]/[HA] Where A⁻ is CH₃COO⁻ and HA is CH₃COOH.

Replacing:

5,000 = 4,740 + log₁₀ [A⁻]/[HA]

1,820 = [A⁻]/[HA] <em>(1)</em>

As buffer concentration is 0,100M:

[A⁻] + [HA] = 0,100 <em>(2)</em>

Replacing (2) in (1)

[HA] = 0,035M

And [A⁻] = 0,065M

As volume is 1,80x10²mL, moles of HA and A⁻ are:

0,180L × 0,035M = <em>6,3x10⁻³mol of HA</em>

0,180L × 0,065M = <em>1,17x10⁻²mol of A⁻</em>

The reaction of HCl with A⁻ is:

HCl + A⁻ → HA + Cl⁻

The add moles of HCl are:

0,0065L×0,330M = 2,145x10⁻³ moles of HCl that are equivalent to moles of A⁻ consumed and moles of HA produced.

Thus, moles of HA after addition of HCl are:

6,3x10⁻³mol + 2,145x10⁻³ mol = <em>8,445x10⁻³ moles of HA</em>

And moles of A⁻ are:

1,17x10⁻²mol - 2,145x10⁻³ mol = <em>9,555x10⁻³ moles of A⁻</em>

Replacing these values in Henderson-Hasselbalch formula:

pH = 4,740 + log₁₀ [9,555x10⁻³ ]/[8,445x10⁻³ ]

pH = 4,794

<em>The pH change in </em>5,000-4,794 <em>= 0,206 units</em>

I hope it helps!

8 0
3 years ago
What Size container do you need to hold 0.0459 mol of N2 gas at stp
Allushta [10]
Hello!

You need to calculate the volume of the container. To calculate the volume of this amount of N₂ gas we need to make the assumption that N₂ behaves like an ideal gas. 

1 mole of an ideal gas under Standard Temperature and Pressure occupies 22,4 L so the calculations are as follows:

0,0459 mol N_2* \frac{22,4 L}{1 mol N_2}= 1,028 L

So, the volume of the container should be 1,028 L or more.

Have a nice day!
4 0
3 years ago
Relative mass each element contributes to the mass as a whole is _________.
Korolek [52]
Your a furry cause I don’t know
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3 years ago
There are no negative consequences to using nuclear energy.<br><br> true or false
Travka [436]
False..........
it has so many consequences

7 0
3 years ago
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lisabon 2012 [21]

Answer:

double layered vacuum seal as the thermal insulators to make a liuqid hot when it cold and keep it cold when its hot.

Explanation:

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