Making a 1% solution of glucose.

Materials and method

Materials

100ml conical flask

Top pan balance

Measuring boat

Glucose

Spatula

Water

Stirring stick

Method

1. First of all put the weighing boat on to the scale than zero the scale.
2. Then you should weight out one gram of glucose on the weighing boat which is on the scales.
3. After this you should put the glucose in to the flask.
4. Then you should wash off the excess glucose off the weighing boat and the sides of the flask with the squeeze bottle in to the flask.
5. Then finally put the water up to nearly 100ml from the tap then use the squeeze bottle to put the water right to the 100ml mark.

Results

My result showed that test tube A had the glucose in it because when we heated it up the colour changed and that test tube B had no glucose in it because the colour did not change.

Evaluation

Problems

One of the problems that I had during the experiment was the weighing boat was too small to carry one gram of glucose in it. To over come this we got a bigger weighting boat that could carry one gram of glucose. Another problem that I had during the experiment was that we were using normal flask which were very hard to read 100ml off and not specific ones which could have been much easier to read 100ml off.

Alternative Methods

Instead of using a conical flask which is hard to read off and is inaccurate we could have used a volumetric flask which is very accurate. The reason why the volumetric is very accurate is because it goes to a lot of tests to make sure they are exactly right. On the volumetric flask that we had in school it says at room temperature that were the line is at it will be exactly 250ml it is also very accurate because at the bottom it is wide and when you go up the flask it has a very thin neck which makes it more easily to read the mark off. The reason why we used the conical flask instead of the volumetric flask was because they are very expensive and my school can not afford them but our teacher showed us how to use a volumetric flask.

                                                            Volumetric Flask

   

                                                         Conical Flask