What is the pH of lemonade

Experiment of the month
September 2013

   

Almost all drinks are slightly or moderately acidic. Alkaline solutions cause a soapy feeling and are therefore not very attractive. The acid content nevertheless varies significantly - you can find pH values ​​between 2 and 5 in the usual drinks. The first impression is often deceptive ...

Equipment and chemicals:
Beakers, various drinks, pH test strips, indicator paper or pH meters.

Execution:
Different drinks are tested with pH test strips, indicator paper or pH meters. The drinks can then be sorted according to increasing pH value (schoolchildren in particular are often surprised by the result ...).
Some typical pH levels are:
Cola: pH 2.0-2.5
Lemonade: pH 2.5-3.0
Vinegar: pH 2.5-3.0 (for comparison)
Lemon juice: approx. PH 3.0
Vegetable juices: pH 3.0 - 3.5
Fruit juice drinks: pH 3.0 - 3.5
White wine: pH 3.0 - 3.5
Apple juice: approx. PH 3.5
Red wine: pH 3.5-4.0
Orange juice: approx. PH 4.0
Beer: pH 4.5 - 5.0
sour sparkling water: approx. pH 5.0

Explanation:
Fruits naturally contain acids (especially citric, tartaric and malic acids). These can then also be found in the juices - even if they were made from concentrate. Lemon juice is usually added to vegetable juices (tomato, carrot juice, etc.). Lemonades are mainly mixed with citric acid, cola drinks contain phosphoric acid.

Disposal:
The samples used can be added to the wastewater.

Literature & Links:
C. Jansen: Lecture at the Science Forum Chemistry 2013 in Darmstadt

Mrs Dr. Christa Jansen (Merck KGaA) and Mrs. Petra B. Carbon (Heinrich-Böll-Schule Rodgau) I thank you very much for your support.


August 2013: Alizarin lakes

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Page created on: Tuesday, September 3, 2013,A. Schunk,Charité - University Medicine Berlin.

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