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
eimsori [14]
3 years ago
9

You need to prepare 1.0 L of solution containing 1.0 mM MgCl2 and 0.15 M NaCl from stock solutions of 1.0 M MgCl2 and 0.50 M NaC

l. You will:
Chemistry
1 answer:
attashe74 [19]3 years ago
4 0

Answer:

mix 1 mL of the stock solution of MgCl2, 300 mL of the stock solution of NaCl and 699 mL of water.

Explanation:

We need to determine the volume necessary of both stock solutions. When a dilution is made, a certain volume of the stock solution is collected and then more solvent is added to it until the volume is completed. So, the number of moles of the solute in both solutions are the same, and it is the concentration (C) multiplied by the volume (V). If 1 is the stock solution and 2 the diluted solution:

C1*V1 = C2*V2

So, in this case, the two solutions will be mixed, and then the volume will be completed with the solvent. So, for MgCl2:

C1 = 1.0 M

C2 = 1.0 mM = 0.001 M

V2 = 1.0 L = 1000 mL

1*V1 = 0.001*1000

V1 = 1 mL of the stock solution of MgCl2

For NaCl:

C1 = 0.50 M

C2 = 0.15 M

V2 = 1000 mL

0.50*V1 = 0.15*1000

V1 = 300 mL

So, it will be necessary 1 mL of the stock solution of MgCl2, 300 mL of the stock solution of NaCl and 699 mL of water.

You might be interested in
In the science lab, students are testing solutions as acids or bases. the ph level of solution "x" was determined to be an 8. wh
monitta
Solution 'X" would be a base. 

5 0
3 years ago
Feeding levels within an ecosystem are
alisha [4.7K]

Answer:

C. trophic levels

Explanation:

Trophic levels are the feeding positions of all organisms in a specific ecosystem. There are five main trophic levels, or feeding levels.

-----------

Habitats are the environment in which organisms live. They are not feeding levels.

Taxonomic levels are a way of classifying species. They consist of (in order) domain, kingdom, phylum, class, order, family, genus, and species. They are not feeding levels.

Cladograms are branching diagrams that show the relationship between multiplt organisms/species. It too is not a feeding level.

Thus, is answer is C.

hope this helps!

3 0
2 years ago
If a gas occupies 4600 mL at 0.9 atm and 195°C, what is the new volume in ml
Bumek [7]

Answer:

The new volume is 2415 mL

Explanation:

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases.

Boyle's law says that the volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure and is expressed mathematically as:

P * V = k

Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

\frac{V}{T} =k

Gay-Lussac's law indicates that when there is a constant volume, as the temperature increases, the gas pressure increases. And when the temperature is decreased, the gas pressure decreases. This can be expressed mathematically in the following way:

\frac{P}{T} =k

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\frac{P*V}{T} =k

Having two different states, an initial state and an final state, it is true:

\frac{P1*V1}{T1} =\frac{P2*V2}{T2}

In this case:

  • P1= 0.9 atm
  • V1=4,600 mL= 4.6 L (being 1 L=1,000 mL)
  • T1= 195 °C= 468 °K (being 0°C=273°K)

The final state 2 is in STP conditions:

  • P2= 1 atm
  • V2= ?
  • T2= 0°C= 273 °K

Replacing:

\frac{0.9 atm*4.6L}{468K} =\frac{1 atm*V2}{273K}

Solving:

V2=\frac{0.9 atm*4.6L}{468K}*\frac{273K}{1 atm}

V2= 2.415 L =2,415 mL

<u><em>The new volume is 2415 mL</em></u>

6 0
3 years ago
Pls answer the question
Artyom0805 [142]

Answer:

1) fractional distillation

3) centrifugation

8 0
4 years ago
Read 2 more answers
Light travels three-fourths as fast through water as it does through a vacuum.
Talja [164]
1.33 is the answer thank me later
4 0
4 years ago
Read 2 more answers
Other questions:
  • if an atom is found to have an atomic mass equal to 3 times greater than carbon,what is its atomic mass?
    15·2 answers
  • PLEASE HELP ASAP
    13·1 answer
  • Which of the following is the balanced equation for P + O2 → P2O5? Question 3 options: A) 4P + O2 → 2P2O B) P + 5O2 → 2P2O5 C) 4
    10·2 answers
  • Which pair of compounds is listed in order of increasing (more exothermic) lattice energy? MgO &lt; CsCl LiF &lt; LiI v LiF &lt;
    6·1 answer
  • Which of the following is NOT a property of a base?
    8·2 answers
  • Is defined as
    6·1 answer
  • Which ionic compound would you predict to have a higher boiling point: NaBr or
    14·1 answer
  • Is this a scientific model? Use complete sentences to explain why or why not.
    7·1 answer
  • HELP HELP HELP! NOW ANSWER THE IMGAGE'S 50POINTS!
    8·1 answer
  • Question 1-8
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!