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
Troyanec [42]
3 years ago
8

A pharmacist has a 12% solution of boric acid and a 20% solution of boric acid. How much of each must he use to make 80 grams of

a 15% boric acid solution
Chemistry
1 answer:
Iteru [2.4K]3 years ago
5 0

Answer:

  • <u><em>He must use 50g of the 12% solution and 30 g of the 20% solution.</em></u>

<u><em></em></u>

Explanation:

Call x the amount of <em>12% boric acid </em>solution to be used.

  • The content of acid of that is: 0.12x

Since he wants to make <em>80 grams</em> of solution, the amount of <em>20% boric acid</em> solution to be used is 80 - x.

  • The content of acid of that is{ 0.20(80 - x).

The final solution is <em>15% </em>concentrated.

  • The content of boric acid of that is 0.15 × 80 g.

Now you have can write your equation:

         0.12x+0.20(80-x)=0.15\times 80

Solve:

           0.12x + 16 - 0.20x=12\\\\-0.08x=12-16\\\\0.08x=4\\\\x=4/0.08\\\\x=50

That is 50 grams of the 12% solution of boric acid.

Calculate the amount of the 20% solution of boric acid:

         80-x=80-50=30

That is 30 grams.

Then, he must use 50g of the 12% solution and 30 g of the 20% solution.

You might be interested in
I really need help guys in order to pass this. its kinda urgent!
lbvjy [14]
Female energy the answer is the first one
6 0
3 years ago
What is the percent by mass of oxygen in carbon dioxide (CO2)?
wariber [46]

Answer:

= 72.73%

Explanation:

The percentage by mass of an element is given by;

% element = total mass of element in compounds/molar mass of compound × 100

The mass of oxygen in carbon dioxide = 32 g

Molar mass of CO2 = 44 g

Therefore;

% of O2 = 32/44 × 100%

             <u>= 72.73%</u>

8 0
3 years ago
2. How many moles of salt are present in 1.5L of a 5.OM salt water solution?
madam [21]

Answer:

There are 7.5 moles of salt

Explanation:

5.0M means that in every liter of solution, there are 5 moles of salt. So, 1.5L of solution times 5 moles per liter equals 7.5 moles

8 0
3 years ago
Explain why every cell in the human body requires support by the circulatory system regardless of its function. Use scientific e
noname [10]
Okay , i’m kinda confused about this
4 0
3 years ago
Read 2 more answers
2. The most recent ice age ended about
zloy xaker [14]

Answer:

The most recent ice age ended about 10,000 years ago

Explanation:

The last ice age began 110,000 years ago and ended 10,000 years ago, leading to the temperature of the Earth, expansions of glaciers and polar ice caps were made.

5 0
3 years ago
Other questions:
  • A volatile liquid is one that ______?
    13·1 answer
  • Suppose that 0.48 g of water at 25 ∘ C condenses on the surface of a 55- g block of aluminum that is initially at 25 ∘ C . If th
    9·1 answer
  • What energy is needed to make evaporation happen
    15·1 answer
  • Arrange the following in order of size, from smallest to largest: polymer, monomer, carbon atom,
    12·1 answer
  • Which two compounds are classified as bases by the Brønsted-Lowry definition, but not by the Arrhenius definition, and why?
    8·1 answer
  • Which organic compound builds, maintains, and replaces tissue in your body? A. protein B. carbohydrates C. lipids
    13·1 answer
  • Every element has a unique amount of
    8·1 answer
  • Assignment
    9·1 answer
  • Chlorine (Cl) is 76% chlorine-35 and 24% chlorine-37. Determine the average atomic mass of chlorine. Show/Explain work.
    5·1 answer
  • What should go in the blanks?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!