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Nataly_w [17]
3 years ago
14

2mL of a serum sample was added to 18mL of phosphate buffered saline (PBS) in Tube 1. 10mL of Tube 1 was added to 40mL of PBS in

Tube What is the dilution of serum in Tube 2?
Chemistry
1 answer:
Sladkaya [172]3 years ago
4 0

Answer:

Tube 2 has a total dilution of 1:50

Explanation:

We have a 2 ml serum sample added to a 18 mL phosphate buffered saline sample in tube 1. This means now in tube 1 there is 20 mL.

We have a 1:10 (= 2:20) dilution here.

10 ml of this 1:10 diluted tube 1 is taken and added to a 40 mL of PBS in tube 2.

Now we have 50 mL in tube 2.

This is a 10:50 (= 1:5) dilution.

The total dilution is 10x5 = 50

So the total ditultion has a rate 1:50

Tube 2 has a total dilution of 1:50

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how many grams of potassium chloride, KCL(molar mass is 74.55g/mol) are produced if 25 grams of potassium chlorate KClo^3 decomp
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Step 1: Calculate moles of KClO₃ as;

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Step 2: Find moles of KCl as;

According to equation,

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So,

               0.204 moles of KClO₃ will produce  =  X moles of KCl

Solving for X,

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Step 3: Calculate mass of KCl as,

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