A student wants to test for the concentration of food dye FD&C Yellow #5 (Tartrazine) in a yellow Starburst candy. First, the student must prepare standard solutions for the calibration curve. The student has a stock solution of FD&C Yellow #5; the concentration is 0.1140 M. The student takes 6.50mL of the stock solution and dispenses it into a 50.0mL volumetric flask. The flask is then diluted to volume with water. What is the concentration of this standard solution?
The molarity of the diluted standard solution is obtained by calculation to be 0.015 M.
Recall the dilution formula;
C1V1 = C2V2
C1 = Initial concentration = 0.1140 M
V1 = initial volume = 6.50mL
C2 = Final concentration = ?
V2 = Final volume = 50.0mL
Making C2 the subject of the formula and substituting values;
C2 = C1V1/V2
C2 = 0.1140 M × 6.50mL/50.0mL
C2 = 0.015 M
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What is the molarity of a solution of 3.0 mol of KCl in 4.0L of water?
The number of moles of a solute per liter of solution is measured using the unit of concentration known as molarity.
Thus, The approach for resolving molarity issues is quite straightforward. This describes an easy way to figure out how molarity of a solution.
Remembering the units of molarity (M): moles per liter, is the key to calculating molarity. Calculate how many moles of the solute are dissolved in a solution's liter volume to determine its molarity.
The molarity of a solution made by combining 23.7 grams of KMnO4 with 750 mL's worth of water. You must first determine the amount of moles of the solute because this example lacks the liters or moles required to determine molarity.
Thus, The number of moles of a solute per liter of solution is measured using the unit of concentration known as molarity.
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1: How can you divide Pepper & Sand to make a solution?
Answer:
Mixture of sand, pepper powder and salt can be separated by dissolving the mixture into water. Sand and pepper powder is insoluble in water while salt is soluble. So they are separated by the filtration method.
1. If the surface area of liquid is large then evaporation will be
A. small
B. large
C. moderate
D. slow
1. If the surface area of liquid is large then evaporation will be
A. small
B. large
C. moderate
D. slow
Answer:-B. Large
Explanation:-Evaporation increases with increasing surface area. This is because the greater the surface area (exposed to the air), the more molecules escape into the air.
More surface area = Higher rate of evaporation.
What do these red/yellow/orange-precipitate reactions have in common? (choose
the best answer)
They all made the same color.
They all have a barium (Ba+2) cation.
They all have a chromate (CrO4-2) ion.
They all have a chloride ( C1-1) ion.
Answer:
3 is the correct I think so
Answer:
They all have a chromate (CrO4-2) ion.
Explanation:
HELP WAAAAAAAAAAAAAAA
Answer:
5. 0.02 seconds
6. (a) 0.0167 seconds
(b) Period in Lebanon is 0.02 seconds and in the U.S 0.0167 seconds. That means that the U.S. has the faster period.
Explanation:
Which of following is not an ingredients for photosynthesis?
A. oxygen
B. carbon dioxide
C. light energy
D. water
Answer:
A. oxygen
Explanation:
Oxygen is the waste created after photosynthesis.
Answer:
oxygen
Explanation:
photosynthesis are for plants and plants don't need oxygen
How many moles of Iron (III) Oxide are found in 429 grams of Iron III Oxide?
Answer:
2.686485288205376 Explanation:
1 grams Iron(III) Oxide is equal to 0.0062622034690102 mole.
When 25.0 g of NaCl is added to 175 g of water, the mass percent (m/m) NaCl is ________. 7.00% 8.00% 12.5% 25.6% 14.3%
Answer:
12.5%
Explanation:
percent blurf = quantity of blurftotal quantity×100quantity of blurftotal quantity×100
So for percent by mass, both quantities are expressed as mass, and it’s the mass of NaCl divided by the total mass of the solution, then times 100%
mass % NaCl = 25 g/175g×100
mass %NaCl = 14.3%
Someone help me with this asap for 5p points and BRAINLIEST THANK YOU
Answer:
High trainability allows the owner to train the dog to handle certain things--some dog can be trained as police dogs and can be taught various jobs, so high trainability is very important
When a dog is Viscous, the dog will keep people away from your house, they will be able to keep danger away and because they are viscous they will be able to handle danger.
Loud bark- A loud bark from a dog can help alert other people when there is a intruder, it makes alot of noise so they can attract attention easily.
Quiet Bark- Ideal for pet owners who do not like noise, they bark quietly so they are not a bother to work or anyone doing something.
50 PIONTS PLZZZ HELP
What volume of 0.100 M K2S solution contains 3.5 g of the solute?
Answer:
mols solute(K2S) = grams/molar mass = ?
Then M = mols/L. You know M and mols, solve for L.
Explanation:
3.5/0.1
L= 35
Hope this helps!!
Please tell me if I have made a mistake!!
I enjoy learning from them:)
Answer:
0.32L
Explanation:
Use formula of V= wt/mm•M.
To get this information we need to first get the molar mass (mm).
mm:
K - 2 x 39.09
S - 1 x 32.06
K2S - 110.262 g/mol
Now we plug it back into the equation.
3.5g/ (110.262 g/mol) • (0.100M)
= 0.317 L of solution
To round to the correct number of siginficant figures the answer is.
= 0.32 L
which two body systems are primarily responsible for locomotion
Locomotion and movement are brought about by skeletal and muscular system of the body. It’s a coordinated event of the skeletal and muscular system brought by contraction and relaxation of muscles.
How does locomotion occur in our body?
Locomotion occurs with help of specialised muscles, muscular and non-muscular by nature.
It involves the interaction of muscles (tendons and ligaments) and skeletal joints and cartilage
Locomotion is a voluntary action which require involvement of the nervous system.
In muscles actin and myosin protein forms cross bridges, consuming ATP.
Hence, to bring about locomotion skeletal and are responsible.
Learn more about locomotion.
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mixing calcium chlorine with water is a chemical or physical change?
Answer:
Physical Change
Explanation:
what is the number of protons in a neutral atom with 31 electrons and 38 neutrons?
31
I think. Protons and electrons share the same number as well as the atomic number.
Answer:
31 protons
Explanation:
Protons are positively charged and electrons are negatively charged so if it is a neutrally charged atom (which most are) the protons and electrons will be equal.
Please Help
Predict the nature of the indicated covalent
bond. Polar or Non polar
Answer:
Nonpolar
Explanation:
7
How many grams are there in 5 moles of CO2?
A 225.5 g
B) 220.05 g
C)240 g
D) 230 g
how many kernels are in a bag of microwave popcorn?
Is this statement true or false?
A compound is a substance made of two or more elements joined in a chemical reaction.
true
false
The correct answer is False.
Give one use of magnesium chloride
Answer:
Magnesium Chloride is used as a precursor magnesium metals.
Explanation:
Someone please help, I will give brainliest, I am desperate. NO LINKS!!!
Answer: A. 8.8%
Explanation:
Percent Error Formula: approximate error - actual value divided by actual value (Approximate-Actual/Actual). After those steps are completed, multiply by 100 to make it a percentage form.
0.365 - 0.400 = -0.035
-0.035 / 0.400 = 0.0875
0.0875 * 100 = 8.75%
8.75% rounded to the nearest tenth is 8.8%
What is freshly pumped oil called?
Answer:
When the drill hits oil, some of the oil rises from the ground high into the air. This immediate release of oil is known as a "gusher." Once a reservoir has been located, pumps are used to extract the oil.
What is freshly pumped oil called?
petroleum
Explanation:
1.37x1020 uranium atoms
Explanation:
1397.4 uranium atoms......
Circle the compound below that does not contain an alkaline earth metal.
Ca(OH)2, Sro, Mg3N2, NaOH, MgCl2, Bas
NaOH.
Na = Sodium which is in group 1 of periodic table which are alkaline metals. all the others are alkaline earths as they are all in group 2.
How did the Heisenberg uncertainty principle contribute to the idea that electrons occupy “clouds,” or “orbitals”?
How do you prepare 500ml of 1.77M H2SO4 solution from an 18.0M H2SO4 Stock solution
Answer:
Take 49.2-ml of 18.0 M H2SO4 stock solution and pour it into a 500-ml volumetric flask. Fill to the 500-ml line with distilled water to make 1.77M H2SO4 solution.
Explanation:
use the formula M1V1=M2V2
volume must be in liters(L)
[tex](1.77)(500 \times {10}^{ - 3} ) = (18)v2 \\ 0.885 = 18v2 \\ v2 = \frac{0.885}{18} \\ v2 = 0.04916[/tex]
0.04916L × 1000 = 49.16 ml = 49.2 ml
When a solution of cesium chloride (CsCl) is subjected to high-speed centrifugation, a stable density gradient is formed.
a. True
b. False
Please help me with this
Beer Lambert Law Explanation
Answer:
The Beer–Lambert law, also known as Beer's law, the Lambert–Beer law, or the Beer–Lambert–Bouguer law relates the attenuation of light to the properties of the material through which the light is travelling.
Explanation:
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Answer:
Melting point, boiling point, state of matter at room temperature, heat of vaporization, flammability and reactivity
Explanation:
a bond in which only one pair of
electrons is shared?
Answer:
A single covalent bond
Explanation:
A single covalent bond is when only one pair of electrons is shared between atoms. A sigma bond is the strongest type of covalent bond, in which the atomic orbitals directly overlap between the nuclei of two atoms.
Answer:
Single covalent bond.
Explanation:
Single covalent bond is the type of bond in which only one pair of electrons is shared between atoms.
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Hope this helped!
~AH1807Calculate the empirical formula for acetaminophen(Tylenol)
