Normality and Concentration Calculations

The video tutorial covers several chemistry calculations. It begins with explaining how to determine a 1 to 4 dilution using serum and saline. Next, it demonstrates converting glucose concentration from mg/dL to mmol/L through a series of steps. The tutorial then explains how to calculate normality by using molarity and valence. Finally, it shows how to prepare a calcium sulfate solution by calculating the grams needed for a given molarity.

What is the total volume of the solution when 25 microliters of serum is mixed with 75 microliters of saline?

• 125 microliters

• 75 microliters

• 50 microliters

• 100 microliters

What is the dilution ratio of serum to the total solution?

• 1 to 4

• 1 to 2

• 1 to 5

• 1 to 3

How many milligrams of glucose are there in 1 liter if there are 450 mg in 1 deciliter?

• 450 mg

• 4,500 mg

• 45,000 mg

• 450,000 mg

What is the final concentration of glucose in millimoles per liter after conversion?

• 2.5 millimoles per liter

• 250 millimoles per liter

• 25 millimoles per liter

• 0.025 millimoles per liter

What is the first step in converting glucose concentration from mg/dL to mmol/L?

• Use the molecular weight of glucose

• Convert milligrams to grams

• Convert moles to millimoles

• Convert deciliters to liters

What is the molecular weight of glucose used in the conversion process?

• 98 g/mol

• 136 g/mol

• 180 g/mol

• 250 g/mol

What is the formula to calculate normality?

• Normality = Molarity / Valence

• Normality = Molarity * Valence

• Normality = Molarity + Valence

• Normality = Molarity - Valence

If the molarity is 0.12 and the valence is 2, what is the normality?

• 0.48 normal

• 0.24 normal

• 0.12 normal

• 0.06 normal

What is the gram molecular weight of calcium sulfate used in the calculation?

• 250

• 98

• 136

• 180

How many grams of calcium sulfate are needed to prepare 1 liter of a 0.5 molar solution?

• 272 grams

• 136 grams

• 68 grams

• 34 grams