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
Dmitriy789 [7]
3 years ago
8

4. Find the pH at each of the following points in the titration of 25 mL of 0.3 M HF with 0.3 M NaOH. The Ka value is 6.6x10-4 a

. The initial pH b. After adding 10mL of 0.3 M NaOH c. After adding 12.5 mL of 0.3 M NaOH d. After adding 25 mL of 0.3 M NaOH e. After adding 26 mL of 0.3 M NaOH
Chemistry
1 answer:
yawa3891 [41]3 years ago
6 0

Explanation:

Since HF is a weak acid, the use of an ICE table is required to find the pH. The question gives us the concentration of the HF.

HF+H2O⇌H3O++F−HF+H2O⇌H3O++F−

Initial0.3 M-0 M0 MChange- X-+ X+XEquilibrium0.3 - X-X MX M

Writing the information from the ICE Table in Equation form yields

6.6×10−4=x20.3−x6.6×10−4=x20.3−x

Manipulating the equation to get everything on one side yields

0=x2+6.6×10−4x−1.98×10−40=x2+6.6×10−4x−1.98×10−4

Now this information is plugged into the quadratic formula to give

x=−6.6×10−4±(6.6×10−4)2−4(1)(−1.98×10−4)−−−−−−−−−−−−−−−−−−−−−−−−−−−−√2x=−6.6×10−4±(6.6×10−4)2−4(1)(−1.98×10−4)2

The quadratic formula yields that x=0.013745 and x=-0.014405

However we can rule out x=-0.014405 because there cannot be negative concentrations. Therefore to get the pH we plug the concentration of H3O+ into the equation pH=-log(0.013745) and get pH=1.86

You might be interested in
The descriptions below explain two ways that water is used by plants on a sunny day. I. In a process called transpiration, some
eduard
The correct answer for this question is this one: "<span>In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change</span>. "
Hope this helps answer your question and have a nice day ahead.
8 0
3 years ago
Read 2 more answers
Arranges the following molecules in order of increasing dipole moment: <br> H2O, H2S, H2Te, H2Se.
erastova [34]

Explanation:

Dipole moment is defined as the measurement of the separation of two opposite electrical charges.

H_{2}O is a bent shaped molecule with a dipole moment of 1.87.

H_{2}S is also a bent shaped molecule with a dipole moment of 1.10.

H_{2}Te is a also a bent shaped molecule and has a negligible dipole moment.

H_{2}Se has a dipole moment of 0.29.

Therefore, given molecules are arranged according to their increasing dipole moment as follows.

        H_{2}Te < H_{2}Se < H_{2}S < H_{2}O

7 0
3 years ago
Which of the following elements has six valence electrons?<br> Be<br> B<br> C<br> N<br> O
Yakvenalex [24]
Oxygen (O) ,Neon (Ne),Argon (Ar)
7 0
2 years ago
The distance to nearby stars can be measured by using ?
BigorU [14]

Nearby stars are measured with parallax, which involves two measurements of the star's exact position in the sky.

Hope this helped!

Good luck :p

Brainliest is appreciated <3

~ Emmy

8 0
3 years ago
A gaseous compound containing hydrogen and carbon is decomposed and found to contain 82.66 % carbon and 17.34 % hydrogen by mass
dolphi86 [110]
C4H10 is the answer to your question
8 0
3 years ago
Other questions:
  • The element, boron, is represented by which of the following chemical symbols? Be Br B Ba
    14·2 answers
  • A mixture of c2h2 and ch4 has a total mass of 230.9 g. when this mixture reacts completely with excess oxygen, the co2 and h2o p
    14·1 answer
  • Elaborate on the suitability of "cola" type drinks to polish chrome surfaces. A) The basic pH of cola allows for easy removing o
    5·1 answer
  • When magnesium carbonate, mgco2, reacts with nitric acid, hno3, magnesium nitrate and carbonic acid form. carbonic acid then bre
    9·2 answers
  • Mass of pennies is 26.0g and final volume is 54 mL. What is density of pennies?
    7·2 answers
  • Equal volumes of two solutions, one containing a strong acid at pH 2 and the other containing a strong base at pH 12, are mixed.
    14·1 answer
  • Cabbage juice turns pink in solutions with pH below 7 and green in solutions with pH above 7. You drop some cabbage juice in a s
    12·1 answer
  • What happens when copper nitrate II is heated​
    14·1 answer
  • 5. Juan's car gets an average of 24 miles per gallon of gas. How far can Juan go on
    7·2 answers
  • How does a phenol red-containing solution look if co2 level is high?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!