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
chubhunter [2.5K]
3 years ago
7

Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.60.

Chemistry
1 answer:
max2010maxim [7]3 years ago
3 0

Answer:

15.1 mL of the HCl solution should be added

Explanation:

First off, let's use the definition of pH to find the desired number of H⁺ moles:

pH = -log[H⁺]

2.80 = -log[H⁺]

= [H⁺]

[H⁺] = 1.58 x 10⁻³ M

Then we use the definition of Molarity [C=n/V]:

[H⁺] = 1.58 x 10⁻³ M = molesH⁺ / 1.00 L

molesH⁺ =  1.58 x 10⁻³

So in the end there needs to be 1.58 x10⁻³ moles of H⁺ to achieve the desired pH.

Now let's calculate the added amounts of HCl and NaOH

mL HCl = 100 - 84 = 16 mL = 0.016 L

mL NaOH = 100 - 88 = 12 mL = 0.012 L

mol HCl = 0.016 L * 7.00x10⁻² M = 1.12x10⁻³ mol HCl = mol H⁺

mol HCl = 0.012 L * 5.00x10⁻² M = 6.0x10⁻⁴ mol NaOH = mol OH⁻

OH⁻ reacts with H⁺, producing water. So the moles of H⁺ remaining in the solution are:

1.12x10⁻³ - 6.0x10⁻⁴ = 5.2x10⁻⁴ mol H⁺

This means that the moles of H⁺ that we need to add are:

1.58x10⁻³ - 5.2x10⁻⁴ = 1.06x10⁻³ mol H⁺

Finally we calculate the required volume of HCl:

C = n/V

7.00 x10⁻² M = 1.06x10⁻³ mol H⁺ / V

V = 0.0151 L = 15.1 mL

You might be interested in
A sample of a compound is determined to have 1.17 g of carbon and 0.287 g of hydrogen. what is the correct representation of the
yarga [219]

CH3 is the empirical formula for the compound.

A sample of a compound is determined to have 1.17g of Carbon and 0.287 g of hydrogen.

The number of atom or moles in the compound is

1.17 g C X  1 mol of C / 12.011 g C = 0.097411 mol of C.

0.287 g H x 1 mol of  H / 1 g H = 0.28474 mol H.

This compound contains 0.097411 mol of carbon and 0.28474 mol of Hydrogen.

So we can represent the compound with the formula C0.974H0.284.

Subscripts in formulas can be made into whole numbers by multiplying the smaller subscript by the larger subscript.

we can divide 0.284 by 0.0974.

0.284 / 0.0974 = 3.

So here, Carbon is one and hydrogen is 3.

We can write the above formula as a CH3.

Hence the empirical formula for the sample compound is CH3.

For a detailed study of the empirical formula refer given link brainly.com/question/13058832.

#SPJ1.

5 0
2 years ago
The temperature of 15 grams of water is increased by 3.0 Celsius degrees. How much heat was absorbed by the water? (specific hea
frozen [14]

Answer:

188.1J

Explanation:

obtained from Q=MCT

8 0
2 years ago
Please I need helppppp
lord [1]

Answer:

FeCl_{2} +H_{2} S->FeS + 2HCl

Explanation:

I am assuming that we have to balance this equation. On the left side, we have one Fe, 2 H, 2 Cl, and 1 S. On the right side, we have 1 Fe, 1 H, 1 Cl, and 1 S. Adding a 2 as a coefficient in front of the HCl on the right side will make 2 H and 2 Cl instead, balancing the overall equation.

3 0
3 years ago
Read 2 more answers
Which of these are examples of alternative forms of producing energy?
vova2212 [387]

Answer:

I think the answer is

D Wind, Solar, Hydro-Electric

Explanation:

8 0
2 years ago
Read 2 more answers
Compare and contrast thomsons plum pudding model with rutherfords nuclear atomic model
Aloiza [94]
Rutherford's model did not completely re imagine Thomson's. Like Thomson, Rutherford still believed that atoms contained negatively charged electrons. Unlike the plum pudding model, where those atoms simply floated in "soup," Rutherford believed they orbited the central nucleus just as planets orbit the sun.
6 0
3 years ago
Other questions:
  • Give two reasons why the flame test is sometimes invalid
    8·2 answers
  • Lead has a density of 11.3 grams/cm cubed. What mass of lead will fit in a 20 cm cubed container?
    6·1 answer
  • Force necessary to change an object's motion
    11·1 answer
  • Which gas has approximately the same density as c2h6 at stp no nh3 h20 so2?
    13·1 answer
  • When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
    9·1 answer
  • Each molecule of hydrochloric acid, hcl, contains one atom of hydrogen and
    15·1 answer
  • What are middle-latitude cyclones?
    11·1 answer
  • In the reaction shown above , the?
    6·1 answer
  • What is the difference between light photons and infrared photons?
    10·1 answer
  • Ladybugs eat aphids on plants. Ajoy counts the number of ladybugs in one square meter of his garden.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!