1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
frutty [35]
3 years ago
15

A 10.0 mL sample of 0.25 M NaOH(aq) is titrated with 0.10 M HCl(aq) (adding HCl to NaOH). Determine which region on the titratio

n curve the mixture produced is in, and the pH of the mixture at each volume of added acid. Assume that the volumes of the solutions are additive. Part a): 1) After adding 15.0 mL of the HCl solution, the mixture is the equivalence point on the titration curve. 2) The pH of the solution after adding HCl is
Chemistry
1 answer:
Anna11 [10]3 years ago
5 0

Answer:

1) After adding 15.0 mL of the HCl solution, the mixture is before the equivalence point on the titration curve.

2) The pH of the solution after adding HCl is 12.6

Explanation:

10.0 mL of 0.25 M NaOH(aq) react with 15.0 mL of 0.10 M HCl(aq). Let's calculate the moles of each reactant.

nNaOH=\frac{0.25mol}{L} .10.0 \times 10^{-3} L=2.5 \times 10^{-3}mol

nHCl=\frac{0.10mol}{L} \times 15.0 \times 10^{-3} L=1.5 \times 10^{-3}mol

There is an excess of NaOH so the mixture is before the equivalence point. When HCl completely reacts, we can calculate the moles in excess of NaOH.

                    NaOH       +       HCl       ⇒       NaCl      +         H₂O

Initial          2.5 × 10⁻³         1.5 × 10⁻³               0                      0

Reaction    -1.5 × 10⁻³        -1.5 × 10⁻³          1.5 × 10⁻³          1.5 × 10⁻³

Final            1.0 × 10⁻³               0                 1.5 × 10⁻³          1.5 × 10⁻³

The concentration of NaOH is:

[NaOH]=\frac{1.0 \times 10^{-3} mol }{25.0 \times 10^{-3} L} =0.040M

NaOH is a strong base so [OH⁻] = [NaOH].

Finally, we can calculate pOH and pH.

pOH = -log [OH⁻] = -log 0.040 = 1.4

pH = 14 - pOH = 14 - 1.4 = 12.6

You might be interested in
You are given a sample of limestone, which is mostly CaCO3, to determine the mass percentage of Ca in the rock. You dissolve the
irakobra [83]

Answer:

34.15% is the mass percentage of calcium in the limestone.

Explanation:

Mass of precipitate that is calcium oxalate = 140.2 mg = 0.1402 g

1 mg = 0.001 g

Moles of calcium oxalate = \frac{0.1402 g}{128 g/mol}=0.001095 mol

1 mole of calcium oxalate have 1 mole of calcium atom.

Then 0.001095 moles of calcium oxalate will have 0.001095 moles of calcium atom.

Mass of 0.001095 moles of calcium :

0.001095 mol × 40 g/mol = 0.04381 g

Mass of sample of limestone = 128.3 mg = 0.1283 g

Percentage of calcium in limestone:

\frac{0.04381 g}{0.1283 g}\times 100=34.15\%

34.15% is the mass percentage of calcium in the limestone.

7 0
3 years ago
Read 2 more answers
Use the image to answer the question.
Lena [83]

Answer:

1. the process of plants taking in sunlight and creating oxygen

2. outputs are oxygen

3. inputs are sunlight

Explanation:

7 0
3 years ago
Read 2 more answers
Why is seawater a better conductor of electricity than freshwater?
GenaCL600 [577]

Answer:

please refer to the attachment above;)

3 0
3 years ago
Read 2 more answers
Which of the following is the electrical charge on an atom that contains 6 electrons, 3 neutrons, and 4 protons?
Y_Kistochka [10]

Answer:

Its electrical charge is -2.

4 0
3 years ago
N2 + 3H2 = 2NH3
My name is Ann [436]
This is so basic bro u gotta first move
6 0
3 years ago
Other questions:
  • From left to right, the three regions of a phase diagram represent the _____ of a substance.
    6·2 answers
  • A gas has a volume of 25.6 L at a temperature of 278 K. What will be the new temperature, in C, if
    8·1 answer
  • Which of these products is made from an animal product?
    6·1 answer
  • How do pickles turn to pickles?
    6·2 answers
  • 32. Calculate How many kilojoules of heat are re-
    7·1 answer
  • Find the mass of calcium oxide produced from the thermal decomposition of 50 g of calcium carbonate.
    6·1 answer
  • How does size affect weight?<br> (20 points, write at least 5 sentences answer pls thx!)
    9·1 answer
  • Select the correct answer from each drop-down menu.
    10·1 answer
  • two substances have the same temperature the particles of substance a have a slower averagr speed than the particles in substanc
    10·1 answer
  • .The base which is used in space ships and submarine is
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!