In what aspects can substitute products like malic acid and ascorbic acid replace citric acid?

Malic acid (found in apples) provides tartness like citric acid but is less acidic. Ascorbic acid (Vitamin C) acts as an antioxidant but has different solubility properties. Both can replace citric acid in food, cosmetics, and cleaning but may alter effectiveness.

Malic acid and ascorbic acid can replace citric acid in certain applications due to their similar chemical properties. For example, they can be used as acidulants to adjust the pH of foods and beverages, or as antioxidants to prevent oxidation and extend shelf life. However, the specific choice of substitute will depend on the desired properties and the application in question.

Malic acid: For sourness (use 1.3x citric acid).
Ascorbic acid: For preservation (same weight).
Vinegar: For cleaning (1:1 but rinse thoroughly).
Cream of tartar: In baking (1:2 ratio).
Each has trade-offs: malic acid’s lingering sourness vs. ascorbic’s antioxidant focus.

Citric acid in a supermarket is typically found in the baking aisle or the section dedicated to food additives and seasonings. However, the specific aisle number can vary from one supermarket to another. In some stores, it might be near the baking powders, yeast, and other ingredients used for baking. In others, it could be with the salt, sugar, and other basic food seasonings. Sometimes, it may also be located in the section where canning supplies and preservatives are sold, as citric acid is often used in canning to help preserve food. If you can't find it in these areas, it's advisable to ask a store employee for assistance. They should be able to direct you to the correct location based on the store's layout.