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
IrinaVladis [17]
3 years ago
10

Professionals in a scientific laboratory and in the healthcare field need to accurately prepare solutions for a number of reason

s. If you wear contacts, you probably use a saline solution to rinse your contacts. What solutions do you use at work? How would you calculate the amount of solute to the solvent to prepare this solution? If you do not wear contacts but you use or make cleaning solutions for your housework, how would you accurately prepare solutions to clean? What solutions do you use that use percent concentration? Please give an example
Chemistry
1 answer:
Nana76 [90]3 years ago
4 0

Answer:

Solutions are made up of two components; these are the solutes and the solvent. knowing the exact amount of each of this within a solution is important for scientists ; this is mostly expressed as concentrations of solutions

Explanation:

The concentration of solutions are usually expressed using different annotations. it can be expressed as molarity, %w/v, %w/w, %v/v.

To calculate the amount of solute needed to prepare a solution , one must understand the unit used to express the concentration of the solution

For example, a 10%w/v solution of NaOH means the solution contains 10 g of NaOH pellets dissolved in 100 mL of distilled water .

i use 0.25M sucrose solution more in my laboratory and i prepare

0.25 M means in 1000 ml of sucrose solution there is 0.25 mole of sucrose ;

no of mole =  mass/molar mass

molar mass of sucrose is 342.297 g/mol thus

mass = no of mole x molar mass

0.25 mol x 342.297 g /mol

= 85.57 g

You might be interested in
Which subatomic particles have a positive charge and are located in the nucleus?
d1i1m1o1n [39]

Answer: Atomic Particles

Explanation:

toms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

8 0
2 years ago
What average global temperature is maintained when there is a balance in Earth’s energy budget?
Thepotemich [5.8K]
The incoming and outgoing energy at the Earth’s surface must balance. Or in other words,  the flow of energy into the atmosphere must be balanced by an equal flow of energy out of the atmosphere and back to space.<span>
Earth's Energy balance describes how the incoming energy from the sun is used and returned to space. All </span>of the energy entering earth’s atmosphere comes from the sun. Half of it is absorbed by the earth’s surface i.e. the land and oceans, 30% is directly reflected back to space by clouds and 20% is absorbed by the atmosphere and clouds.<span>Earth's </span>actual<span> average global temperature is around 14° C (57 F).</span>
8 0
3 years ago
Read 2 more answers
Why might people add a base to an acidic lake?
spayn [35]

Answer:

To decrease the algae

Explanation:

Acid lakes have more algae than other lakes

6 0
3 years ago
Soil that are light in color have a great amount of humus in<br> them. True or False
GaryK [48]

Answer:

please the answer Is false

6 0
2 years ago
How many valence electrons are in N2O? SeCl2? PBr3?
8090 [49]
Here is the answer for the three of them
<span>N20 = 16 e-
</span><span>SeCl2 =20
</span><span>PBr3 = 26 
Remember that t</span><span>o find the valence electrons in an atom you need to identify what group the element is in. An element in group 1A has 1 valence electron. If the element is in group 2A, then it has two valence electrons.</span>
5 0
3 years ago
Other questions:
  • Evidence of a chemical change would be a ___________________. Question options: spinning top. rusting car fender. spilled bucket
    15·1 answer
  • Which characteristic is given by the angular momentum quantum number
    6·2 answers
  • Many manufacturing processes involve chemical reactions that reach equilibrium. Why would chemists adjust conditions to favor th
    5·2 answers
  • Calculate the pH at of a 0.10 Msolution of anilinium chloride . Note that aniline is a weak base with a of . Round your answer t
    13·1 answer
  • A substance that forms a vapor is generally in what physical state at room temperature? A gas b liquid c liquid or solid d solid
    8·1 answer
  • Into what 4 classes can elements be sorted based on their electron configurations
    8·1 answer
  • What molecule does oxygen gas bond with in the bloodstream of a human
    13·1 answer
  • As the mass of a substance increases the density.......
    5·1 answer
  • A chemical reactions is shown. How many different elements and total atoms are involved in the reaction?
    14·1 answer
  • What is the outre layer and large part of the sun´s atmosphere
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!