it depends on how much acid is in a fruit. If there is a lot of acid the pH is low, and the fruit is sour. If the pH is high, the fruit is more likely to be sweeter, and there is little acid in the fruit.
The acid that causes the sourness in the fruit can vary, but is in many cases citric or ascorbic acid.
how can you tell that vinegar is sour
Vinegar has a sour taste. (Think pickles)
there isnt. you could use vinegar but that would make it "sour" sorry
Vinegar is sour due to the presence of acetic acid, which is formed when bacteria ferment the sugars in alcohol to produce vinegar. Acetic acid gives vinegar its tangy flavor and low pH levels, resulting in its characteristic sour taste.
Acetic acid is responsible for the sour taste of vinegar.
VINEGAR
no
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sour,acidic
sour,acidic
salt
Vinegar