Calculating Concentration and Ratios

This video tutorial covers titration calculations, starting with a review of basic concepts and moving into detailed examples. It explains how to calculate the concentration of an unknown solution using known values and formulas. The tutorial emphasizes understanding the reaction proportions and provides a practice question for viewers to test their knowledge. By the end, viewers should be able to perform titration calculations and understand the underlying principles.

What is the primary goal of titration calculations?

• To calculate the pH of a solution

• To find the concentration of an unknown solution

• To measure the temperature of a reaction

• To determine the color of a solution

In the first example, what is the initial volume of the unknown solution?

• 25 cubic centimeters

• 20 cubic centimeters

• 30 cubic centimeters

• 15 cubic centimeters

How do you convert cubic centimeters to cubic decimeters?

• Multiply by 1000

• Add 1000

• Divide by 1000

• Subtract 1000

What is the concentration of the known solution in the first example?

• 0.5 mole per cubic decimeter

• 0.4 mole per cubic decimeter

• 0.3 mole per cubic decimeter

• 0.2 mole per cubic decimeter

What is the formula for calculating the concentration of an unknown solution?

• Concentration of known solution multiplied by volume of unknown solution

• Concentration of known solution divided by volume of known solution

• Concentration of known solution multiplied by volume of known solution divided by volume of unknown solution

• Volume of known solution divided by concentration of known solution

Why might using the formula alone not earn full marks in an exam?

• It is not allowed

• It is not accurate

• It does not demonstrate understanding

• It is too complicated

In the second example, what is the ratio of sodium hydroxide to sulfuric acid?

• 3:1

• 2:1

• 1:1

• 1:2

What is the concentration of sulfuric acid after considering the reaction ratio?

• 0.25 mole per cubic decimeter

• 0.125 mole per cubic decimeter

• 0.5 mole per cubic decimeter

• 0.3 mole per cubic decimeter

What is the first step in solving the practice question?

• Calculate the pH

• Convert volumes to cubic decimeters

• Find the temperature

• Measure the mass

What is necessary to know before calculating the concentration of an unknown solution?

• The mass of the solution

• The color of the solution

• The temperature of the solution

• The volume and concentration of a known solution