This table reports the pH and sugar content of various beverages. Colas are dark
ID: 185354 • Letter: T
Question
This table reports the pH and sugar content of various beverages. Colas are dark beverages that are usually carbonated and contain caramel coloring. Examples include Coke, Pepsi, RC, and Dr. Pepper. Non-colas lack the caramel coloring, examples include 7-Up, Sprite, Mountain Dew, and Slice. Generally, root beer and iced tea are not considered colas. "Lemon Brisk" is a brand of bottled iced tea Analyze the data provided in this table, then select the best supported answer to the questions below Sugar (g 1 240 ml)t 0.0 31.0 pH* 7.672 4.038 3.706 3.365 3.298 3.289 3.229 3.202 3.169 3.059 3.031 2.899 2.868 2.530 2.525 2.522 2.387 Beverage Tap water Mug Root Beer Diet 7 Up Diet Mountain Dew Sprite Diet Coke Mountain Dew 7 Up Diet Dr. Pepper Slice Orange Diet Pepsi Dr. Pepper Lemon Brisk Pepsi Coke Cherry Coke RC Cola 26.0 31.4 24.6 10.9 274 22.0 26.6 27.0 28.0 26.6 Jain P, Nihill P, Sobkowski J, Agustin MZ (2007) Commercial soft drinks: pH and in vitro dissolution of enamel. Gen Dent. 55:150-154 t Energy fiend, (date unknown) Sugar in drinks http://www.energyfiend.com/sugar-in-drinks. (Accessed June 29, 2010) What conclusion can you draw on the apparent relationship between the pH of colas and non-colas? What conclusion can you draw on the apparent relationship between the pH of a sugared-cola and its diet-cola version?Explanation / Answer
1a. The colas include Coke, Pepsi, RC and Dr pepper, that have the following pH.
Colas
pH
Sugar (g/240 ml)
Coke
2.525
27
Pepsi
2.53
26.6
RC Cola
2.387
26.6
Dr Pepper
2.899
27.4
Diet Pepsi
3.031
0
Diet Coke
3.289
0
Cherrie Coke
2.522
28
Diet Dr Pepper
3.169
0
The noncolas include Mountain Dew, 7-up, slice and Sprite.
NonColas
pH
Sugar (g/240 ml)
Diet 7 up
3.706
0
Diet mountain Dew
3.365
0
Sprite
3.298
26
Mountain Dew
3.229
31.4
7 up
3.202
24.6
Slice Orange
3.059
10.9
The pH scale is a logarithmic scale and a pH of 2 is 10 times more acidic than a pH of 3.
The pH of colas is between 2.387-2.899 while the pH of non-colas is between 3.059-3.298. Hence, the pH of cola less than pH of non-colas, indicating that colas are more acidic than non-colas. However, the diet versions of the colas (pH: 3.031-3.289) and non-colas (pH: 3.365 and 3.706) is nearly the same. The diet versions of colas have increased pH due to no sugar present. However, sugar content has not much effect on pH of non-colas.
1b. Colas have sugar present in them while their diet versions lack sugar. The pH of colas increases when the sugar is removed from the drink. Hence, diet versions of the colas have a higher pH than the pH of colas.
2. The pH of battery acid is 1 while pH of lemon juice is 2.2. Rounding the pH of lemon juice to the nearest integer will give a pH of 2.
The pH of battery acid is 10 times more acidic than lemon juice.
This is because the ph scale is a logarithmic scale. Hence, pH1 is ten times more acidic than pH 2.
The sulphuric acid in the battery acid makes it more toxic than citric acid that is present in lemon juice. Sulphuric acid will cause severe skin burns, irritate the nose and throat, and induce breathing problems when inhaled. Lemon juice when diluted has several health benefits. However, when taken without dilution in water will cause gastrointestinal problems or erode the teeth. However, these effects are much more subtle as compared to battery acid. Sulphuric acid is a strong acid while citric acid is weak acid.
Colas
pH
Sugar (g/240 ml)
Coke
2.525
27
Pepsi
2.53
26.6
RC Cola
2.387
26.6
Dr Pepper
2.899
27.4
Diet Pepsi
3.031
0
Diet Coke
3.289
0
Cherrie Coke
2.522
28
Diet Dr Pepper
3.169
0
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