Final blog

My final blog. I have finished my report and have added more onto my mindmap. Im finished! (On Monday I changed from plastic to bone)

Science Project -Blog Entry 7

These are 3 pictures I took during my experiment.

Picture 1 : Shows plastics in the drink and pH paper.
Picture 2 : Shows drinks.
Picture 3 : Shows results of the pH paper.


Here is a table of my results

Type of Drink pH Length of bone Initial bone length = 5cm Appearance Coke 4 4.5cm Change color – went dark brown Solo 3.5 4.4cm Decayed – went brown Fanta 5 4.6cm Change color – went orange Orange Juice 3.5 4.4cm Went orange and yellow Lemonade 3 4 cm Became light yellow

Here is a graph of the pH levels of the drinks.
Here is a graph on the results in bone length
Here is a discussion of my findings

Discussion

Discussion

The trends and patterns found in my experiment were that juices are more acidic than soft drinks. A drink such as solo which has traces of lemon (5%) has shown to be still acidic with a pH of 3. The findings also show that the high pH drinks (lemonade, solo, orange juice highly affected the bone compared to the other drinks (fanta, coke,) which did not affect it as much. These drinks also had a pH of 4-5. Basically this means that the drinks with lower ph (acidic) can break down more of the bone than higher ph drinks.

The errors and weaknesses I made in the experiment were that I used a thick bone that did not show a great effect on coke or fanta. Another weakness that affected the test was using a pH paper with a smaller scale than usual.

If I repeated this experiment another time I would choose to improve the experiment by changing the material to something more thin and weak because the bone I used was far too strong giving small results and I should have left the experiment for more than twelve hours and changed it to 24+ hours. I would’ve also used a different pH paper which went from 1-14pH.

I believe my experiment was very reliable because after repeating the experiment I obtained the same results. Validity was proven by keeping the dependant variable the same throughout the experiment. But I should have used a different pH paper, one that would show answers from 1-14pH because some of the drinks could’ve been either higher or lower and this is why I believe the accuracy of the experiment wasn’t 100%. But the results did show a pH that matched the scale so I believe it was still correct (if it didn’t it would have showed a different or no color at all).

From the results our findings indicate that Lemonade and Solo had the lowest pH reading of 3 thus making it the most acidic and Fanta had the highest pH reading of 5, making it the most neutral.

The results also show that Orange juice and lemonade were the most effective on the bone and famta was the least effective on the bone.

After being in the drinks for 12hours, Lemonade had reduced its bone in size by 1cm.The other drinks reduced the bone by:

Coke - 0.5cm

Solo - 0.6cm

Fanta - 0.4cm

Orange Juice 0.6cm

After looking at the bone i saw a change in color from the bones.

Coke - Became Dark brown

Solo - Decayed and became brown

Fanta - Became orange

Orange Juice - Became orange and yellow

Lemonade - Became light yellow (mostly white still)

My experiment matched the hypothesis because Lemonade had the strongest acidity and was one of the strongest in breaking down the bone. I believe the results were like this is because a lemon actually has 138 mg (3%) per 100g of phosphoric acid in the fruit. This is a lot more than coke. Though solo was also equal with the lemonade but did not affect the bone.