Exact concentrations are very important in medicine. For example, the concentrat

Question

Exact concentrations are very important in medicine. For example, the concentrations of sodium and potassium ion in your blood are vital for the regulation of your blood pressure and the working of your nervous system. Your kidney control these concentrations- of levels in your blood are not normal this show that your kidneys are not working properly.

The table below shows the normal range for number of chemicals found in your blood. The quantities measured are very small. They include micromoles and millimoles.

Solute

Normal Blood level

Creatinine (a waste product of muscle metabolism)

60-120 µmol dm-3

Urea (a waste product of protein metabolism)

3.5-6.5 mmol dm-3

Na+ (sodium ions)

135-145 mmol dm-3

K+ (potassium ions)

3.5-5.0 mmol dm-3

You can use the table to calculate the amount of the different substances in your body. For example, an average person has 5 dm-3 of blood.

What is the minimum mass of sodium ions in the blood of an average person?

What is the maximum mass of urea in the blood of an average person?

What is the minimum mass of creatinine in the blood of an average person?

What is the maximum mass of potassium ion in the blood of an average person?

( molar mass of creatinine is 113 g mol-1 ; molar mass of urea is 60 g mol-1)

Solute

Normal Blood level

Creatinine (a waste product of muscle metabolism)

60-120 µmol dm-3

Urea (a waste product of protein metabolism)

3.5-6.5 mmol dm-3

Na+ (sodium ions)

135-145 mmol dm-3

K+ (potassium ions)

3.5-5.0 mmol dm-3

Explanation / Answer

Exact concentrations are very important in medicine. For example, the concentrat

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