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
Damm [24]
2 years ago
9

A student dissolves 4 g of salt into 10 g of water. The total weight of the solution is 14 g. The student then heats the solutio

n until all of the
liquid turns into a gas and only the salt is left. The student is able to collect the evaporated gas. The student weighs the salt left over from the
solution and the evaporated gas.
How much should the student expect the salt and vapor to weigh?
A 48
B. 10 g
C 14g
D. 28 g
Chemistry
1 answer:
shtirl [24]2 years ago
3 0
C. or B. ok :) !! ! Hopes this hepls
You might be interested in
H2 + O2 ---&gt; H2O<br> Classifying reaction
Degger [83]

Answer:

hydrogen + oxygen = water

3 0
3 years ago
Read 2 more answers
33) How many significant figures does the number 40230 have? *
Lyrx [107]

Answer:

5

Explanation:

they are all significant All non-zero numbers ARE significant

4 0
3 years ago
When Raymond observes certain natural phenomena, he often forms ideas about their causes and effects. Suppose that Raymond surmi
rodikova [14]

Answer:

true

Explanation:

5 0
2 years ago
Read 2 more answers
If you have a density of 3g/meander a mass of 15g what is the volume?
erma4kov [3.2K]
M=D*V,
V=m/D
m=15 g
D=3 g/ml
V=15 g/3 g/ml=5 ml


7 0
3 years ago
What are the primary chemical components present in a phosphate buffer at ph 7.4? H3po4 and po43–?
fenix001 [56]

Answer :

The correct answer for primary component of phosphate buffer at pH = 7.4 is H₂PO₄⁻ and HPO₄²⁻ .

<u>Buffer solution :</u>

It is a solution of mixture of weak acid and its conjugate base OR weak base and its conjugate acid . It resist any change in solution when small amount of strong acid or base is added .

<u>Capacity of a good buffer : </u>

A good buffer is identified when pH = pKa .

From Hasselbalch - Henderson equation which is as follows :

pH = pka + log \frac{[A^-]}{[HA]}

If [A⁻] = [HA] ,

pH = pka + log 1

pH = pKa

This determines that if  concentration of  weak acid  and its conjugate base are changed in small quantity , the capacity of  buffer to maintain a constant pH is greatest at pka .  If the amount of [A⁻] or [HA] is changed in large amount , the log value deviates more than +/-  1M and hence pH .

Hence Buffer has best capacity at pH = pka .

<u>Phosphate Buffer : </u>

Phosphate may have three types of acid-base pairs at different pka ( shown in image ).

Since the question is asking the pH = 7.4

At pH = 7.4 , the best phosphate buffer will have pka near to 7.4 .

If image is checked the acid - base pair  " H₂PO₄⁻ and HPO₄²⁻  has pka 7.2 which is near to pH = 7.4 .

Hence we can say  , the primary chemical component of phosphate buffer at pH = 7.4  is H₂PO₄⁻ and HPO₄²⁻  .


8 0
3 years ago
Other questions:
  • 1) List the number of protons, neutrons, and electrons in Carbon-13.
    11·1 answer
  • If 140. mg of fluorine-18 is shipped at 8:00 A.M., how many milligrams of the radioisotope are still active when the sample arri
    8·2 answers
  • What characteristic do photosynthesis and combustion share?
    12·2 answers
  • What is an input force?
    12·2 answers
  • Why is carbon considered tetravalent?
    12·1 answer
  • What is a group of atoms bonded together
    10·2 answers
  • What is the molar mass of magnesium chlorite (Mg(CIO2)2)?
    6·1 answer
  • What is the relstionship between a mutatation and gene
    14·1 answer
  • Name the subatomic particles in nucleus
    15·1 answer
  • How long does it take light to travel from the Earth to the Sun? The speed of light is 2.998×10^5 km/s and the Sun is 1.496×10^8
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!