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Bingel [31]
3 years ago
14

A 1.0l buffer solution contains 0.100 mol of hc2h3o2 and 0.100 mol of nac2h3o2. the value of ka for hc2h3o2 is 1.8×10−5. part a

calculate the ph of the solution upon the addition of 0.015 mol of naoh to the original buffer. express the ph to two decimal places.
Chemistry
1 answer:
Brilliant_brown [7]3 years ago
3 0

Hey there!:

Ka = 1.8*10⁻⁵

Pka = 4.74

add the moles of  NaOH to moles of base:

0.015 moles + 0.100 moles => 0.115 moles

Since you add mol base you have to take away that same , amount from acid:

0.100 acid  - 0.015  NaOH = 0.085

Therefore :

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

pH = 4.74 + log [ 0.115 ] / [ 0.085 ]

pH =  4.87600

Hope that helps!

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The chemical label indicates the following information.

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5 0
2 years ago
Which of the following measurements is expressed to three significant figures?
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Which of the following measurements is expressed to three significant figures?
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4. A balloon is filled with 3.0 L of helium at 310 K. The balloon is placed in an oven where the
77julia77 [94]

Answer:

3,29L

Explanation:

3.29L = V2

 

Formula: V1/T1 = V2/T2

--------------------

Given:

V1 = 3.0 L V2 = ?

T1 = 310 K T2 = 340 K

--------------------

Plugin:

(X stands in place of V2 just to make it easier to look at)

[3.0L / 310K = X / 340K]

(3.0L / 310K = 0.01L/K)

0.01L/K = X / 340K

(multiply 340K on both sides, it cancels out on the right)

0.01L/K * 340K = X

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**3.29L = X**

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4 0
2 years ago
If all other variables remain unchanged, what happens to the output force when the area of the input piston is doubled?
mars1129 [50]

Answer:

1250N

Explanation:

This question is based on pascal's Law.

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therefore  =force on input piston =25N

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therefore after putting the values we get,

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3 years ago
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