What is the pH value of milk,curd ,saliva, washing soap, soap, toothpaste and tamarind?

pH scale measure whether solution is acidic or basic. Solution is acidic if its pH is below 7 and basic if pH is above 7 on pH scale.

Note: At pH=7, there are equal numbers of H3O+ ions and OH- ions in water. It is called as neutral solution.

Observe the products you have asked and what kind of solutions they are in day to day life.

Milk:Fresh milk has a pH of 6.7 whereas cow’s milk has a Ph between 6.4 and 6.8

Curd:pH between 4.5 to 5.5. You can observe that curd pH level are lower than that of milk because of generation of Latic acid in curd.

Saliva:the pH of saliva is 7.4 but it varies from pH 5.0 to pH 8.0. n acidic meal leads to a lower pH value and an alkaline meal leads to a higher pH.

Washing soap: Depends on what kind of washing soap you’re looking for:-

  1. Liquid detergent  = pH 5.5
  2. Compact detergent = pH 5.5
  3. Alkaline soap = pH 9.5

If lemon is in the soap they will be more acidic.

Toothpaste:pH 9 . It should be alkaline as it helps to neutralise plaque acids which is primary reason for tooth decay.

Tamarind:pH 1.8 to 3.7 because it has high level of fluoride.

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milk- 6.4 to 6.8 (for cow's milk)

curd- 4.5 to 5.5

saliva- 6.2 to 7.4

washing soap- 5.5 to 9.5

soap- 8 to 10

toothpaste- 9


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MILK : 6.5

CURD : 4.5 TO 5.5





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