Rennin is “found in the stomached of mammals that are still being fed n milk’ ? a calf. Source: internet Heading: 9. 2 Maintaining a balance: 1. Temperature range Extract from Biology Stage 6 Syllabus (Amended October 2002) Board Of Studies, NEWS Available at: http://has. CSS. Deed. AU/biology/core/ balance/9 2 1/921 net. HTML Accessed: 30th November 2003 Questions Two: Factors tested The effects of the following when added of changed in the making of junket Control > this experiment was done following the instructions on the back of the packet so I would have something to compare my other experiments to. Temperature Change > by using boiling water rather than cold water to solve the junket tablet I was able to see changes in the way junket reacted to milk with different temperatures. Ph Alteration> by altering the pH( adding lemon juice) was able to observe the chemical reaction of rennin with a changed pH Increased Salinity > adding salt to the junket and milk solution I could observe what would happen with an increased of salinity in junket.
Experiment One: Control Aim: to investigate the action of junket on milk Equipment needed: Hansen Junket tablet Stopwatch Small saucepan Measuring cup x 2 Table spoon Thermometer 1 bowl h litter of fresh milk Method: dissolve 1 Hansom’s plain tablet into a tablespoon of cold water Gently warm h litter of fresh milk to lukewarm temperature (ICC) Max. Add dissolved junket tablet to lukewarm milk and stir for a few seconds pour into bowl and time how long it takes to set.
Rest Its: Tablet dissolved quickly without force Started to coagulate in six minutes and completely set in fifteen minutes. Aright white in color Firm to touch Experiment Two: Temperature Aim: to determine the outcome what if a junket tablet is dissolved into boiling water will it still set. Equipment needed: a kettle to boil water dissolve 1 Hansom’s plain tablet into a tablespoon of boiling water Gently warm h litter of fresh milk to lukewarm temperature (ICC) Max. Pour When boiling water was added to the junket tablet it did not dissolve as the control tablet had done.
The junket tablet had to be broken up with a spoon in order for it to dissolve. The milk turned patchy and yellow in color Started to set in nine minutes finished setting at twenty minutes Experiment 3: Alteration of PH Aim: to observe what happens when the PH of junket is altered Equipment deed: Equipment needed: Hansen Junket tablet 5 drops of lemon juice warm h litter of fresh milk to lukewarm temperature (ICC) Max. Add five drops of lemon juice to the warmed milk add dissolved junket tablet to lukewarm milk and stir for a few seconds Pour into bowl and time how long it takes to set.