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.
We taste acids as sour. So anything very acidic such as lemon would be very sour.
Concentrated lemon juice is sour
citric acid
sour stuff.
how can you tell that vinegar is sour
Vinegar has a sour taste. (Think pickles)
vinegar is sour because it contains acetic acid acids are sour to the taste
there isnt. you could use vinegar but that would make it "sour" sorry
Acetic Acid is what gives vinegar it's sour taste so they do mix well as acetic acid is what makes vinegar.
sour,acidic
no
salt
sour,acidic
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VINEGAR
Vinegar