# An experiment measuring the relation between density and sugar concentration in standard sugar solut

Converting concentrations between various units: Once you have mastered this topic, you will be able to prepare solutions of desirable concentrations, carry out chemical reactions using correct amounts of solutions, predict amounts produced, and calculate yields. In order build your skills, you are going to calculate concentrations and amounts of solute present in the solution.

Solutions are homogeneous mixtures, the major component being the solvent, and minor components being solute. In terms of stoichiometry, we mainly deal with gases and liquid solutions, but properties solid solutions are emphasized in material sciences.

- Make the appropriate assumption in problem solving;
- The two examples below show the application of the above discussion;
- How to calculate accuracy A sodium chloride NaCl solution is measured with an instrument with an accuracy of 0.

Solution Concentration One of the most important properties of a solution is the concentration, which is the amount of solute dissolved in a given volume or weight of solution. Since there are different ways to represent the quantities, concentration can be expressed in different units. Weight of solute per unit volume of solutionamount in mole per unit volume, weight percentage, and mole percentage are some of the ways.

We need the skill to convert from one type of units to another, because we are part of the real world. Furthermore, we should also have the ability to prepare a solution of desirable concentration, and in this task, we use quantities measured in conventional units g, kg, L, m3 etc.

## Solution Stoichiometry

It is interesting to note that 0. Example 1 In a laboratory, Qem dissolved 11. He added enough water to make the solution exactly 250. What is the concentration of the solution he has prepared? Hint - The molecular weight for sugar C12H22O11 is 342. Your should have the skill to calculate molecular weight. Thus, the concentration is: Example 2 If the 0. Hint - The total weight of the solution is 1. However, the concentration is 4.

Exercise What is the weight percentage? Example 3 A well known fact is that at standard temperature and pressure, one mole of ideal gas occupy 22. What is the concentration in M of this ideal gas? Solution Stoichiometry The amount of solute in certain volume of solution is equal to the volume V multiplied by the concentration C.

## Sugar Solution Density

Delivering a desirable amount of substance is best done by using volume. For example, when the concentration is 0. How much NaOH is there in 0. In problems involving neutralization such as the reaction equation: We used HCl for simplicity in balancing the equation.

If the concentrations of the two solutions are C1 and C2, and the volumes at the equivalence points are V1 and V2 for solute 1 and 2 respectively, their amounts can be calculated. Since their derivation is so trivial, you are expected to derive them whenever required. The two examples below show the application of the above discussion.

Example 5 If 25. Example 6 If 25. Solutions are used in the food we eat, the air we breathe, and the medicine we use. Solutions are also everywhere around us in the environment. Thus, there is a need to keep track of concentrations and amounts of key substances in these solutions so that we are at least aware of how much we eat, drink, or take.

Confidence Building Problems You dissolved 10. Calculate the weight percentage of sugar in the solution. Assume the density of solution to be 1. Calculate and estimate concentration. Calculate the concentration in M.

- Example 6 If 25;
- Solutions are also everywhere around us in the environment;
- A pure number can be obtained from a quantity if we divide by appropriate units;
- We can have 1 ml or 10 gallons of the syrup in Example 1, but its density will always be 1;
- He added enough water to make the solution exactly 250;
- Once you have mastered this topic, you will be able to prepare solutions of desirable concentrations, carry out chemical reactions using correct amounts of solutions, predict amounts produced, and calculate yields.

Calculate the concentration of this solution. How much calcium carbonate Ca HCO3 2 is present in 24. Assume tap water density to be 1. Skill - Apply the equation: Ca HCO3 2 is present in hard-water.

A stock sulfuric acid solution contains 98. How many mL of this acid is required to prepare 5. A bottle of nitric acid has a density of 1. What is the molarity?

Make the appropriate assumption in problem solving. If you want to make 250. Other units - You need 25 mmole or 0. Skill - Explain the dissolution as ionization: How many mL of stock HNO3 solution 16. Prepare solution of certain cencentration by dilution. How many mL of 0. Skill - Performing calculations of titration results. Further consideration - What is the answer if sulfuric acid is used? Given a solution containing 0.