CBS - (Worksheet) Concentrations, Units, Dilution Flashcards
You have a 5 Molar stock solution from which you wish to produce 100ml of working solution at a concentration of 200mM.
Calculate the volume, in ml, of stock solution and water needed to achieve this.
Answer to 0 decimal place.
Working solution is made up from 4 ml of stock plus 96 ml of water.
2) You have a 2 Molar stock solution from which you wish to produce 500ml of working solution at a concentration of 40mM.
Calculate the volume, in ml, of stock solution and water needed to achieve this.
Answer to 1 decimal place.
Working solution is made up from 10 ml of stock plus 490 ml of water.
3) You have a 2 Molar stock solution from which you wish to produce 500ml of working solution at a concentration of 80mM.
Calculate the volume, in ml, of stock solution and water needed to achieve this.
Answer to 0 decimal place.
Working solution is made up from 20 ml of stock plus 480 ml of water.
1) A simple oral rehydration sachet contains 2.5 g NaCl and 12.5 g of anhydrous glucose, with instructions to reconstitute the contents of the sachet with 500 ml of water.
Assuming values of 58.4 for the molecular weight of NaCl, and 180 for the molecular weight of glucose, calculate what would be the concentration of the
i) sodium ions in mmoles/L
ii) glucose in mmoles/L
Answer to 0 decimal place.
i) 86 mmoles/L
ii) 139 mmoles/L
2) A simple oral rehydration sachet contains 2.6 g NaCl and 11.5 g of anhydrous glucose, with instructions to reconstitute the contents of the sachet with 500 ml of water.
Assuming values of 58.4 for the molecular weight of NaCl, & 180 for the molecular weight of glucose, calculate what would be the concentration of the
i) sodium ions in mmoles/L
ii) glucose in mmoles/L
Answer to 0 decimal place.
i) 89 mmoles/L
ii) 128 mmoles/L
Glucose has a molecular weight of 180. You have a solution whose concentration is 63mg.dl^-1.
What is the millimolar concentration?
Answer to 1 decimal place.
3.5 mM
Glucose has a molecular weight of 180. You have a solution whose concentration is 200mg.dl-1.
What is the millimolar concentration?
Answer to 1 decimal place.
11.1 mM
3) Sodium chloride (common salt) has a molecular weight of 58.4. You have a solution whose concentration is 116mg.dl-1.
What is the millimolar concentration?
Answer to 2 decimal places.
19.89 mM
A patient is hypoglycaemic with a blood glucose concentration of 45 mg/dL.
What is his blood glucose in mM given that the molecular weight of glucose is 180?
Answer to 1 decimal place.
2.5 mM
You are preparing an injection of a drug supplied as 5ml ampoules containing a solution at a concentration of 1mg/ml.
The required dose is 50µg/kg body weight and your patient weighs 80kg.
What volume of drug solution do you inject?
Answer to 1 decimal place.
4 ml
You are preparing an injection of a drug supplied as 5ml ampoules containing a solution at a concentration of 1mg/ml.
The required dose is 50µg/kg body weight and your patient weighs 80kg.
How heavy would the patient have to be before you needed more than one ampoule to prepare the injection?
Answer to 1 decimal place.
100 kg
You are preparing an injection of a drug supplied as 5ml ampoules containing a solution at a concentration of 1mg/ml.
The required dose is 30µg/kg body weight and your patient weighs 75kg.
What volume of drug solution do you inject?
Answer to 2 decimal places.
2.25 ml
You are preparing an injection of a drug supplied as 5ml ampoules containing a solution at a concentration of 1mg/ml.
The required dose is 30µg/kg body weight and your patient weighs 75kg.
How heavy would the patient have to be before you needed more than one ampoule to prepare the injection?
Answer to 1 decimal place.
166.7 kg
Potassium bicarbonate tablets are sometimes given by mouth to patients with chronic acidotic states. An effervescent tablet of Potassium bicarbonate weighs 500mg. The molecular weight of potassium bicarbonate is 90.
How much potassium bicarbonate in mmols would it provide when dissolved in a glass of water?
Answer to 1 decimal place.
5.6 mmol
Potassium bicarbonate tablets are sometimes given by mouth to patients with chronic acidotic states. An effervescent tablet of Potassium bicarbonate weighs 500mg. The molecular weight of potassium bicarbonate is 90.
What would the concentration of the solution be if the volume of water is 250 ml?
Answer to 1 decimal place.
22.2 mM
