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Vinegar is a dilute acetic acid.

ACID CURDLING

In normal conditions milk has a pH of about 6.5-6.7 and at this pH value the casein is without protons, it has a negative charge and therefore the casein micelles are relatively soluble, because they repel each others. In an acid ambient milk coagulates, because casein has its isoelectric point at 4.6 pH, that is at this pH value it has a quantity of positive charges equal to the quantity of negative charges and the positive part of each "micelle" is attracted by the negative part of the others, causing the formation of ionic bonds among the "micelle" working against the dipole-dipole bonds with water, so that the protein precipitates in the form of demineralized casein and in the solution remain soluble calcium salts.

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12y ago
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13y ago

Vinegar makes milk curdle and the nature of vinegar is to not mix.

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11y ago

Vinegar is acidic and causes the pH of milk to drop.

When the pH drops, the protein chemistry is changed and the proteins bind together. This causes curdling.

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7y ago

It does not turn into plastic. It curdles. The acid in vinegar causes the protein in the milk to clump together.

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Q: Why does milk and vinegar curdle when mixed?
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Vinegar makes milk curdle and the nature of vinegar is to not mix.


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Bacteria in the milk can also cause it to curdle.


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Do milk and vinegar create a chemical reaction?

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Why does the milk curdle when you add lemon juice to it?

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