fill Ups.......!!
(1) Mg+2HCL______+H2.
(2) vinegar is used as____For food.
(3) carbonate produce _____eating with acids.
(4) Gypsum on heating at 373k produce______.
(5) Acids produce_____ions in aqueous solution.
(6) Chemical formula of washing soda is_______.
(7) ph of a______solution is 7.
(8) On dilute ph of an acidic solution_______.
Answers
Answer: 1] MgCl2
2] Vinegar is commonly used in food preparation, in particular pickling liquids, vinaigrettes and other salad dressings. It is an ingredient in sauces, such as hot sauce, mustard, ketchup, and mayonnaise. Vinegar is sometimes used in chutneys. It is often used as a condiment on its own, or as a part of other condiments.
3]Each of these minerals consists of one or more metal ions combined with a carbonate ion (CO3--). The chemistry of these reactions is similar to the calcite reaction above. The mineral reacts with hydrochloric acid to produce carbon dioxide gas, water, a dissolved metal ion, and dissolved chlorine.
4] When gypsum is heated at 373 K, it loses its water of crystallization or all the water molecules and becomes calcium sulphate hemihydrate. Gypsum is converted to “Plaster of Paris”. On being further heated beyond 373 K, gypsum gives a product known as Gamma “Anhydrite”.
5] Acids dissociate in water or aqueous solutions to form ions. These are responsible for conduction of electricity. Acids don't dissociate hydrogen ions in absence of water. Therefore, we can say that acids produce ions only in aqueous solutions.
6] Na2CO3
Washing soda formula is written as Na2CO3. 10H2O. The chemical name of washing soda is sodium carbonate. Chemically soda ash is a hydrated salt of sodium carbonate.
7] A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value.
8] When an acidic solution is diluted with water the concentration of H + ions decreases and the pH of the solution increases towards 7. To make the pH change by 1, a tenfold dilution is required (eg adding 9 cm 3 of water to 1 cm 3 acid). The acid is becoming less acidic.