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
Nataly_w [17]
4 years ago
9

Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M to give 500 mL of solution. A 15.00-mL aliquot was t

hen diluted to 100.0 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm provided a reading of 327 on an arbitrary scale. A standard 100 ppm quinine solution registered 180 when measured under conditions identical to those for the diluted sample. Calculate the mass of quinine in milligrams in the tablet.
Chemistry
1 answer:
saul85 [17]4 years ago
8 0

Answer:

605.6mg of quinine

Explanation:

Based on Lambert-Beer's law, the intensity of an optical measurement is directely proportional to its concentration.

Unknown concentration gives a reading of 327

100 ppm gives 180 of intensity

The concentration of the diluted quinine tablet is:

327 * (100ppm / 180) = 181.67 ppm. The final dilution

The concentration of the first diluted solution is:

181.67 ppm * (100.0mL / 15mL) = 1211ppm

ppm could be defined as mass of solute (In this case of quinine) in mg per liter of solution. That is:

1211mg / L

As the tablet was diluted to 500mL = 0.5L, the mass of the quinine is:

0.5L * (1211mg / L) =

<h3>605.6mg of quinine </h3>
You might be interested in
1. Which of the following elements has the smallest ionization energy
Serhud [2]

Answer:

chlorine

Explanation:

hope this helps

8 0
3 years ago
A chemist has one solu6on that is 40% sulfuric acid and one that is 10% sulfuric acid. How much of each should she use to make 2
kipiarov [429]

Answer:

12 L of 40% sulfuric acid solution and 8 L of 10% sulfuric acid solution are needed to make 20 L of sulfuric acid solution.

Explanation:

For first solution of sulfuric acid :

C₁ = 40% , V₁ = ?

For second solution of sulfuric acid :

C₂ = 10% , V₂ = ?

For the resultant solution of sulfuric acid:

C₃ = 28% , V₃ = 20L

Also,

<u>V₁ + V₂ = V₃ = 20L</u> ......................................(1)

Using

<u>C₁V₁ + C₂V₂ = C₃V₃</u>

<u>40×V₁ + 10×V₂ = 28×20</u>

So,

40V₁ + 10V₂ = 560........................................(2)

Solving 1 and 2 as:

V₂ = 20 - V₁

Applying in 2

40V₁ + 10(20 - V₁)  = 560

40V₁ + 200 - 10V₁ = 560

30V₁ = 360

<u>V₁ = 12 L</u>

So,

<u>V₂ = 20 - V₁ = 8L</u>

<u><em>12 L of 40% sulfuric acid solution and 8 L of 10% sulfuric acid solution are needed to make 20 L of sulfuric acid solution.</em></u>

4 0
4 years ago
How many moles are in 18.3 grams of Carbon? ​
Vadim26 [7]

Answer:

1.5236414197340638

7 0
3 years ago
How many miles are in aluminum foil when the mass of aluminum is 9.592
AleksandrR [38]

0.36moles

Explanation:

Given parameters:

Mass of aluminium = 9.592g

Unknown:

Number of moles of Aluminium = ?

Solution:

The mass of an atom is related to the number of moles.

The number of moles of an atom is the size of a substance that contains the avogadro's number of particles.

it is related to the number of moles using the expression below;

Number of moles = \frac{mass}{molar mass}

Molar mass of aluminium= 27g/mol

Number of moles = \frac{9.592}{27}  = 0.36moles

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

8 0
4 years ago
Gypsum.
hichkok12 [17]

Answer:

b shale

Explanation:

7 0
4 years ago
Other questions:
  • Mendeleev used his periodic table of elements to
    11·1 answer
  • HELP PLEASE WILL GIVE  BRAINLIEST , the dark portion of the soil created by the decay of organic matters? is called?
    5·2 answers
  • A beaker contains 0.125 L of a 3.00 M solution. If the volume goes up to 0.325 L, what is the new molarity?
    14·1 answer
  • How many moles of iron in a sample that contains 7.91×10^23 atoms of iron?
    11·1 answer
  • Which of the following statements is true?
    6·1 answer
  • How many grams of carbon are in 0.24 moles of carbon?
    9·1 answer
  • For each balanced reaction, indicate the total number of molecules in the table below.
    5·1 answer
  • If something has more mass does it mean it has more atoms?
    10·1 answer
  • Simple land plants lack seeds and
    11·2 answers
  • Consider the reaction Cu + AgNO3 Ag + CUNO3 Which element is reduced? Which element is the oxidizing agent?​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!