can any body tell me how to calculate pH of soft drinks its my project so plz help?

Question

if u know then plz mail me the whole porcedure i cant fing anything on the net and plz dont tell me wrong its my class 12th project..........

Answer 1

the easiest way is to use a pH paper to test the pH. and just compare the reading with the one given with the test kit.

Or you may do some neutralisation. And then calculate with the amount of alkali you use for neutralisation. By that you can calculate the concentration of hydroxide ions in the alkali that you use. Then calculate the pOH for the alkali you use. pH=14 - pOH.
eg.
1mol of NaOH gives you 1 mole of OH ions.
so the pOH = -log1 = 0
pH = 14 - 0 = 14

Just some rough guide. Hopefully it helps...Good luck.

Answer 2

You could email pepsi and coke. The FDA says they have to run quality control on their product, and have specifications of what pH the drinks can be. They could tell you what it is commonly, but make sure they know you are a student.
Or you can use a pH meter.
Or if you just want to do this in your kitchen, or classroom lab. Measure the weight of the can (or you can use a 2L bottle, which might work better) before openning and record that. Open the can and let it sit for a couple days, until it is definitely flat, record the weight of the can and drink then (don't forget to account for the mass of the bottle cap if you use a 2L bottle). Next, make a solution of baking soda in water. Measure out a volume of the soft drink into a cup, then add the baking soda water until it stops any gas formation.
Calculations:
(mass of unopened can) - (mass of opened can) = gas mass change because Carbon dioxide is release to make your drink fizz. This is a process of carbonic acid breaking down to carbon dioxide and water
CH2O3 ---> CO2 + H2O
so now you have the mass of CO2, which is one to one with carbonic acid. Carbonic acid has two hydrogens. The volume of the drink is on the side of the can. So now you have concentration of carbonic acid hydrogens.
But there are other ingredients that are acidic too. You use the baking soda titration to figure those out as well, because baking soda is Sodium bicarbonate, which has a one to one reaction with acid. If you know the volume of soft drink used and the concentration of the baking soda, you have what you need to figure out the concentration of hydrogen ions in that sample of coke/pepsi you titrated with.
Add the two hydrogen ion concentrations together, and throw into a pH equation
pH = -log(hydrogen concentration).
There you go, this is the pH of an unopened can of fizzy beverage.

Answer 3

This can be done in many ways. I will tell you three ways you can use to do this project and i recommend that use all three methods and then compare them for your project.
1. A pH indicator paper can be used to find the ph of the soft drink. The problem with pH paper is that it is not very specific. For example, it might tell you that the pH of Coke is 7 when indeed it might be 6.7. pH indicators only provide integer values for the pH.
2. You can measure pH using electronic pH meters. This machine uses electrodes to measure the hydrogen ion concentration in the solution (soft drink in your case). This meter is very accurate as it gives the pH value up to two decimal places. The only problem with this method is that pH meter might not be available in your school and can be expensive.
3. This is the cheapest and an accurate way of measuring the pH of a soft drink. This process is called titration. For this method you will need to prepare 1molar NaOH solution. You will need an indicator that changes color between pH 6-7. Pour the NaOH solution in a biurette and hang it on a clamp stand. Place your soft drink under the biurette and add like 1-5 ml of your indicator to the soft drink. Now add NaOH to the soft drink drop by drop slowly till the color of the solution starts changing. Count the number of drops added or measure the volume of the NaOH added to the solution. This can be measure from the biurette as you should take a reading before you start pouring NaOH to your soft drink and right after you see a color change in the soft drink. The difference in the reading will tell you the volume of NaOH used. Now, calculate the number of moles of NaOH you used in that volume. The number of moles you calculate will be equal to the number of moles of Hydrogen ions present in your soft dring. Calculate the pH of your soft drink as pH = -log(hydrogen ion concentration).

Answer 4

It would be difficult to calculate it because you don't know how much of anything is in there. The best way to determine pH in this instance is to use an electronic pH meter. They have probes you stick into a solution, and the meter gives you a readout to two digits after the decimal in most cases telling you what the pH is.

Answer 5

There are some paperstripe tests... pH must be some 4-5... anyway, under 7 - all the soft drinks are sour... The Coca-Cola contains orthophosphoric acid... Yoy can see below the Safety (MSDS) data for orthophosphoric acid...

Answer 6

use litmus paper or a pH meter. if you need to make it at home use red cabbage juice. put the cabbage in a blender than strain off the solid mass. what's left can be used as a pH indicator. calibrate it with knows ie ammonia (base) and vinegar (acid) so you know what means what.

Answer 7

When pH of a solution is near its extreamities (14 or 1), the conduction of current is higher through that solution is higher.

I guess, you have got the clue.

For more help you can visit
http://letsdiscuss.info/forums/viewforum.php?f=14

Answer 8

This is meant to be titration project. You would have to understand titration and perform that project in front of your teacher. If you have access to a spectrophotometer, you'd be in luck!

Answer 9

I 'm not sure how to calculate. But u can use a universal pH indicator. no need calculation. GOOD LUCK!!!!!!

Answer 10

i have not inebriated soda in months till my grandma had to flow to the er very last saturday. it truly is like i grow to be so less than pressure and fearful and that i did not favor water i needed sugar and that resulted into me ingesting soda. i have inebriated it each and every evening on condition that then and it SUCKS