Chemistry High School

A prescription is written for 500 mL of a 7% NaCl solution. The technician has a 50% NaCl solution. What volume of
50% NaCl is required for the 7% solution?
mL

Answers

Answer 1

Answer:

70 mL

Explanation:

To solve this problem we can use the C₁V₁=C₂V₂ equation, where the subscript 1 refers to the concentrated solution while subscript 2 refers to the diluted one, as follows:

C₁ = 50V₁ = ?C₂ = 7V₂ = 500 mL

We input the data:

50 * x = 7 * 500 mL

And solve for x:

x = 70 mL

Thus the answer is 70 mL.

Related Questions

Help PLs thnk you!!!!!!!!!!!!!!!!!!!!!!!!

Answers

The answer is A is the correct answer

Identify what type of reaction is this
2AgCl + H2 → 2Ag + 2HCI

Answers

Answer:

single displacement

Explanation:

fill in the blank question














please help asap!!!!!!!!!!!!!!

Answers

Answer:

since unlike charges attract, negative side of another water molecule, neutral

9. Do all enzymes function at the same pH?

Answers

Each enzyme has an optimum pH but it also has a working range of pH values at which it will still work well. This depends on the type of enzyme. The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. ... Catalase has an optimum pH of 9 and a working range of between pH 7-11.        Hope this was helpful

Explanation:

2. When two oppositely charged particles are brought near each other, they produce a torceted the stone
shows the force around two changed particles
Which force do the arrows represent?
A an unbalanced force
B. a frictional force
C.an electrical force
D.a gravitational force

Answers

Answer:

A

Explanation:

An unbalanced force is your answer.

How much energy is needed to heat 9.3 grams of silver metal from 21 °C to 52 °C, if the
specific heat of silver metal is 0.240 J/g °C?
Question 5
4 pts
How much heat must be added if 160 grams of water is heated from 24 °C to 85 °C?
(The specific heat of water is 4.184 J/g °C)

Look at picture
ASAP please will mark as brainlist don’t got much time

Answers

Answer:

question 4. 69.19J

question 5. 40835.84J

Explanation:

question4.

heat needed = mass × specific heat capacity × change in temperature

= 9.3× 0.240×(52-21)

=69.192J

question 5.

heat added = 160× 4.184×(85-24)

= 40835.84J

Please help me i really need help

Answers

Answer:

H2o i think

Explanation:

10. Which of these elements is the most electronetative?
(10 Points)
Nitrogen
Calcium
Bromine
O Aluminum

Answers

it would be nitrogen
Out of the four Nitrogen is the most electronegative. Electronegative is basically determined by whichever atom is closest to F (the most electronegative)

Nitrogen is only a few electrons difference than Fluorine. Bromine is still quite electronegative but it has whole extra valence shells making it not as electronegative as nitrogen

How many oxygen atoms are in diiodine heptoxide?​

Answers

Answer:

there are seven oxygen atoms

Explanation:

look look at the prefix hept- to help you answer this question

Which statement best explains a way in which a cell gets rid of wastes?

Answers

Answer:

I would say B but you don't have to take my word for it

Answer:

D

Explanation:

What type of energy does each ball have before it falls

Answers

As the ball falls towards the ground, its gravitational potential energy is transformed into kinetic energy.

I WILL GIVE BRAINLIST!!!!!!!!!!!!!!!!!!!!!! PLZZZZZZZZZ HELPPPPPPPPPPPPPP


Explain how proper motion will affect the constellation as seen from the earth.

Answers

Proper motion describes how stars slowly drift in space and change their position in relation to the sun. Since stars have proper motion, over time, the patterns we see now in constellations will not be the same.

find the moler mass of P2S3

Answers

Answer:

158.2 g/mol

Explanation:

When energy is released by the pack, what happens to the energy of the surroundings (outside the pack)?
a. The energy increases
b. The energy decreases
c. The energy stays the same

Answers

Answer:

a

Explanation:

i hope that's correct

The energy of the surroundings (outside the pack) will:

a. The energy increases, when energy is released.

Energy in the surroundings:

Energy is delivered to create bonds, which is the reason the enthalpy change for it is positive to break bonds. Energy is expected to break bonds. Particles are a lot more joyful when they are "wedded" and discharge energy since it is simpler and more steady to be seeing someone.

When energy is released, the energy in the surroundings will increase.

Thus, option a is correct.

Find more information about Energy here:

brainly.com/question/25959744

How do you know when a redox equation is balanced?

Answers

Like to check? Just add up the charges on both sides and see if they equal each other:)

To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is

Answers

Answer:

78.04g of 0.448 moles must be added

Explanation:

Using H-H equation we can find the pH of the buffer:

pH = pKa + log [A⁻] / [HA]

Where pH is the pH of the buffer = 7.2

pKa = 7.1

[A⁻] = [K₂HPO₄]

[HA] = [KH₂PO₄]

Replacing:

7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]

0.1 = log [K₂HPO₄] / [KH₂PO₄]

1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)

And as the  concentration of the buffer is:

1M = [K₂HPO₄] + [KH₂PO₄] (2)

Replacing (2) in (1):

1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]

1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]

2.2589 [KH₂PO₄] = 1M

[KH₂PO₄] = 0.44M

And [K₂HPO₄] = 0.56M

In 800mL = 0.8L:

0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:

0.448 moles * (174.2g / mol) =

78.04g of 0.448 moles must be added

All three types of worms that undergo asexual reproduction use which process?
binary fission
budding
fragmentation
spore formation

Answers

Answer:

binary fission

Explanation:

i just took the quiz

Since I'm a tomboy, does that mean I'm gender non-conforming?

Answers

i guess so? ur basically just breaking gender roles/ stereotypes. do what makes u happy :p

Answer:

Hello

Explanation:

I am a girl,not a tomboy.

Will we talk about something?

Venus is the second planet from the Sun. It takes about 225 days for it to complete one revolution. What would make Venus have a longer revolution?

if Venus rotated slower

if Venus were closer to the Sun

if Venus rotated faster

if Venus were farther away from the Sun

Answers

Answer:

if venus were farther away from the sun

Explanation:

it is because far the planet is long the orbit is which make revolution longer

What are facts about Cells

Answers

Cells are the essential designs of every living life form.

Cells give construction to the body, take in supplements from food and complete significant capacities.

Cells bunch together to shape tissues?, which thus bunch together to frame organs?, like the heart and cerebrum.

Our phones contain various practical designs called organelles?.

These organelles do undertakings like making proteins?, preparing synthetic compounds and producing energy for the phone.

The core? is based at the focal point of the cell and is the 'control space' for the cell.

The genome? is found inside the core.

Which layer over time due to chemical and physical weathering leads to the other layers?

Answers

Answer:

chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface

Which of the 3 molecules: Methane, Propane, Butane would release the most energy when combusted?

Answers

Answer:

butane

Explanation:

How many atoms of tin are found in 3.50 moles of tin?

Answers

Answer:

2.11x10²⁴ atoms

Is a large body of flowing water ;created by many smaller flowing together. Aquifer

Answers

Answer:

alll I really know is that it includes smaller pools of water

Why do surface waves break along the shore?​

Answers

As waves reach the shore, the energy in front of the wave slows down due to friction with the shallow bottom. ... The wave breaks, and it usually does so in water depth that is 1.3 times the wave height.

Answer:

because the global sea level rises while the poles temperature increases

Explanation:

What human actions contributed to the nutrient pollution of Lake Okeechobee?
PLZ HELP MEEEEEEEEEEEEEEEE I BEG YOU

Answers

Answer:

These trends were attributed to both the increased external loads and to a reduction in the lake sediment's ability to assimilate nutrients from the water column. The main sources of external nutrient inputs are animal waste and fertilizers applied to food and forage crops.

Explain why the elements in group 7 have 7
valence electrons.

Answers

Answer:

The periodic table was made that way by the scientists who created it

Explanation:

to make things easier for the users.

Why does lowering the pressure cause a liquid to boil?
A. It becomes easier for molecules to escape.
B. It pushes molecules out of the liquid.
C. It causes the temperature to rise.
D. It changes the volume of the liquid.

Answers

Lowering the pressure in a container will cause the liquid in the container to boil faster because it becomes easier for the molecules to escape.

What causes boiling?

Boiling happens when the vapor pressure of a liquid equals the atmospheric pressure.

By lowering the atmospheric pressure, the vapor pressure of a liquid takes a lower time to equal the atmospheric pressure.

Thus, it becomes easier for the molecules of the liquid to escape from each other.

More on boiling and pressure can be found here: https://brainly.com/question/2510654

Question 1 of 10
What do biologists study?
A. Living things
B. The properties of light
C. The properties of matter
D. How matter and energy interact
SUBMIT

Answers

Answer:

A

Explanation:

Biology is the study of living things.

How many grams of Sn will be created when 114 grams of SnO2 react with excess H2? SnO2 + H2 ->Sn + H2O
I

Answers

Explanation:

CNN vfbtgnynynynynyuybunujy

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