Why should curd and sour substances not be kept in brass and copper vessels

all acids are sour in nature. curd,is made from milk which is slightly acidic in nature(as it contains lactic acid).we know that acids react easily with metals to give salt and hydrogen gas. when kept in copper or brass vessels,curd(and other acidic food items) reacts with copper and forms toxic compounds which may be unfit for human consumption,and may cause food poisoning.thus it is not advisable to keep curd and other acidic or sour food items in copper or brass vessels.

Q 1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tubes? SOLUTION: Take three small pieces of red litmus paper. Put one drop each of the given solutions on these litmus papers. The liquid which turns red litmus into blue is a basic solution. Divide the blue litmus paper so formed into two parts. Put one drop each of the other two liquids separately on these two pieces of litmus paper. The solution which turns blue litmus paper red is acidic solution. The solution which does not affect the colour of litmus paper is water. Q 2. Why should curd and sour substances not be kept in brass and copper vessels? SOLUTION: The curd and sour substances are acidic. They will react with brass (alloy of copper and zinc metals) and copper vessels and will spoil the vessels. Q 3. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas? SOLUTION: Hydrogen gas is liberated when an acid reacts with a metal. For example, when zinc metal reacts with dil.HCl, hydrogen is evolved and salt zinc chloride is formed as: Zn ( s) + 2HCl (aq) → ZnCl 2(aq) + H 2( g) It can be tested by bringing a burning candle near the gas. The candle continues burning with a pop sound. Q 4. A metal compound A reacts with dilute hydroc...

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Table of Contents • • • • • • Why curd is not kept in metal containers? not be kept in metal containers (such as copper and brass vessels)? Curds and other sour foods stuff (like lemon, juice, etc.) are acidic in nature. As acids react with metals to produce hydrogen gas, it spoils the food and forms some toxic metal compounds which poison the food. A Clean Glass Container is best for making yogurt. Food-grade plastic can also be used but is not an ideal choice for yogurts that incubate at warm temperatures. Yogurt can be made in one large container or in single-serving containers. Why should curd not be kept in brass? Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food. Can I store yogurt in stainless steel? I use milk with around 3% fat and I still get thick yogurt (not as thick as Greek yogurt). Use a stainless steel or a glass jar to set yogurt. Never ever insert a spoon or any foreign object into the vessel while the yogurt is still setting, it will cause the yogurt to split into curds and it will not set well. Can you store curd in Aluminium utensils explain? Curd contains lactic acid. Aluminium reacts with acids to release hydrogen and form the corresponding aluminium salt. Aluminium is a toxic metal and presence of aluminium salts contaminates the food. Why are acid not stored in metal containers containers mad...