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3 years ago

What is the overall (X-fold) dilution of 4 serial 2-fold dilutions?

Chemistry

1 answer:

svet-max [94.6K]3 years ago

6 0

Answer:

16-fold dilution.

Explanation:

A serial dilution is any dilution where the concentration decrease by the same quantity in each successive step. So, for a 2-fold dilution, the concentration decrease 1/2, it means that if we have a sample with 10 M of concentration, after a 2-fold dilution it will be 5 M. For the next step it will be 1/2 of 5= 2.5 M, and successively.

Then, we just multiply the factor for each dilution. After 4 serial dilutions:

1/2 x 1/2 x 1/2 x 1/2 = 1/16

So, it would be a 16-fold dilution in the end.

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What volume of 0.175 m na3po4 solution is necessary to completely react with 95.4 ml of 0.102 m cucl2?

VARVARA [1.3K]

The volume of 0.175 M Na3PO4 solution that is necessary to completely react withn 95.4 ml of 0.102 M cuCl2 is

calculation

 Step 1:  write the equation for reaction

3CuCl2 (aq) + 2Na3Po4 → Cu3(PO4)2 + 6 NaCl

Step 2 : find the moles of CuCl2

moles = molarity x volume in liters

volume in liters = 95.4 /1000 =0.0954 L

moles is therefore = 0.0954 L x 0.102 M= 0.00973 moles

Step : use the mole ratio to calculate the moles of Na3Po4

The mole ratio of CuCl2 : Na3PO4 is 3:2 therefore = 0.00973 x2/3= 0.00649 moles

Step 4 : find the volume of Na3PO4

volume = moles/molarity

= 0.00649 mole / 0.175=0.037 M

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4 years ago

During the war where did African-Americans receive the best treatment?

Sindrei [870]

Hope this helps. Sorry of it is long

Answer: military

African Americans received the best treatment in the military during war. Making up about 3/4 of the military, African American soldiers proved their efficiency and ability to serve the country, thus receiving more respect from society than if they were to work in more "common" jobs, for example in a factory. However, while they received the best treatment in the military during the war, African Americans still faced segregation within the units of the military, an important fact to note.

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3 years ago

mixture or pure substance: 1.blood 2.dyes 3.self-raising flour 4.muesli 5.copper wire 6.distilled water 7.table salt 8.milk 9.br

jenyasd209 [6]

Answer: Mixture: Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance: Copper wire, distilled water, table salt, oxygen.

Explanation:

Mixture is a substance which is made up two or more number of compounds which chemically inactive and retain their distinct chemical properties.

Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance is defined as anything with uniform and unchanging composition is known s pure substance.

Copper wire, distilled water, table salt, oxygen.

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3 years ago

What kind of matter is smoke?

Neporo4naja [7]

Answer : Colloid

Explanation : Any colloid which consist of a solid evenly dispersed in a gas phase can be called as smoke. So, if smoke has to be given a matter of substance then it is can be categorized as a Colloid present in gaseous phase. Smoke is a solid which contains minute particles of dust which is homogeneously dispersed in the air.

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4 years ago

Read 2 more answers

1) What is the electron configuration of the element with 27 protons?

Romashka [77]

1) cobalt u can tell bc on a periodic table there is a small number that on cobalt is 27.

2) think that would be 11 bc in the 4th shell there can be up to 18 electrons

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3 years ago