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
Scorpion4ik [409]
3 years ago
8

you need to prepare 250.0 mL of a 1.50 M HCl solution from a 2.00 M HCl stock solution. assuming that the accuracy of the concen

tration is important, which type of glassware should you use to make the solution
Chemistry
2 answers:
Savatey [412]3 years ago
7 0

Answer:

I should use a volumetric flask.

Explanation:

If the accuracy of the concentration is important, we need to use a volumetric flask.

IRISSAK [1]3 years ago
4 0

Answer:

The glassware appropriate for dilution preparation is a (250 mL)<em> volumetric flask</em>

Explanation:

We know that molarity or concentration of a solution is the number of moles per litres of solution,  the molarity and volume of the solution in question can be used to find out how much of the stock solution to be diluted using the formula;

c = \frac{n}{v}

Once the variables are confirmed, a 250 mL solution of 1.50M HCl can be prepared by measuring determined stock solute into a 250mL volumetric flask and the making it upto the 250mL mark. (a measuring cylinder can be used to check accuracy of volume added).

You might be interested in
Explain briefly how wind are causd​
Sedbober [7]

The different atmospheric pressures cause the air to have zones with different temperatures, the cold air tends to descend and the hot air to rise because it has less density. This movement of the two airs in the atmosphere is what generates the wind.

4 0
3 years ago
Caffeine, a stimulant in coffee and tea, has a molar mass of 194.19 g/mol and a mass percentage composition of 49.48% C, 5.19% H
lozanna [386]

Answer : The molecular formula of a caffeine is, C_8H_{10}N_4O_2

Solution :

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 49.48 g

Mass of H = 5.19 g

Mass of N = 28.85 g

Mass of O = 16.48 g

Molar mass of C = 12 g/mole

Molar mass of H = 1 g/mole

Molar mass of N = 14 g/mole

Molar mass of O = 16 g/mole

Step 1 : convert given masses into moles.

Moles of C = \frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{49.48g}{12g/mole}=4.12moles

Moles of H = \frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{5.19g}{1g/mole}=5.19moles

Moles of N = \frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{28.85g}{14g/mole}=2.06moles

Moles of O = \frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{16.48g}{16g/mole}=1.03moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = \frac{4.12}{1.03}=4

For H = \frac{5.19}{1.03}=5.03\approx 5

For N = \frac{2.06}{1.03}=2

For O = \frac{1.03}{1.03}=1

The ratio of C : H : N : O = 4 : 5 : 2 : 1

The mole ratio of the element is represented by subscripts in empirical formula.

The Empirical formula = C_4H_5N_2O_1=C_4H_5N_2O

The empirical formula weight = 4(12) + 5(1) + 2(14) + 16 = 97 gram/eq

Now we have to calculate the molecular formula of the compound.

Formula used :

n=\frac{\text{Molecular formula}}{\text{Empirical formula weight}}

n=\frac{194.19}{97}=2

Molecular formula = (C_4H_5N_2O)_n=(C_4H_5N_2O)_2=C_8H_{10}N_4O_2

Therefore, the molecular of the caffeine is, C_8H_{10}N_4O_2

5 0
3 years ago
1) What happened at Chernobyl in 1986? How many people died?
ch4aika [34]

Answer: According to the BBC, the internationally recognized death toll shows that 31 died as an immediate result of Chernobyl. Two workers died at the site of the explosion, another died in hospital soon after due to their injuries and 28 operators and firemen are believed to have died within three months of the accident.

Explanation:

6 0
3 years ago
How many joules will it take to raise 5 grams of water by 1 c
bazaltina [42]
15? Idk I'm guessing I'm sorry
3 0
3 years ago
A chemistry student needs 10.00 g of isopropenylbenzene for an experiment. He has available 120. g of a 42.7% w/w solution of is
babunello [35]

Answer:

The mass of solution the student should use is 23.4 g.

Explanation:

Hi there!

The concentration of the solution, 42.7% w/w, indicates that there is 42.7 g of isopropenylbenzene (IPB) per 100 g of solution. Then, if the student needs 10.00 g IPB, the mass of solution the student should take will be:

10.00 g IPB · (100 g solution/42.7 g IPB) = 23.4 g solution.

Then, the mass of solution the student should use is 23.4 g.

7 0
4 years ago
Other questions:
  • A student placed 3.0 grams of Mg into some HCl in two different experiments. In each case, it reacted according to the following
    11·1 answer
  • How would a sandblasted rock differ from a rock that hasnt been sandblasted
    8·1 answer
  • What is the indicator of the number of ions in solution?
    6·2 answers
  • What is 'Lo Salt' used for?
    5·1 answer
  • A compound has a molar mass of 90. grams per mole and the empirical formula CH2O. What is the molecular formula of this compound
    12·1 answer
  • The [OH-] of a solution is 7.89 10^-12 M. What is the pH of the solution? it acidic or basic? *
    11·1 answer
  • If a glass of water is left in open air for two days ,what changes would it undergo in terms of quality and quantity?​
    13·1 answer
  • When 38.1 grams of a certain metal at a temperature of 90.0°C is added to 100.0mL of water at a temperature of 17.6°C in a perfe
    7·1 answer
  • Don’t waste your time answering with links because I won’t even open it. Plz just give a normal answer. Thanks.
    15·2 answers
  • Which of the following assumptions about gases is false?​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!