laboratory chemicals

A chemical laboratory has 500 ml of 50% acid solution. How much water should be added so that the strength of the solution is 30%? => 33.33 ml or 250 ml or 183.33 ml or 333.33 ml..

In the laboratory, nitrogen is prepared by heating a mixture of ammonium chloride and sodium nitrite and a small quantity of water. If ammonium nitrite is heated by itself it decomposes to produce nitrogen gas. However, this reaction is very fast and may prove to be explosive. For safety,..

Processes by which substances are transformed to one or several products are called chemical reactions. Chemical processes that occur in the presence of light, like sunlight, are called photochemical reactions. These processes can occur naturally or under controlled condit..

Introduction - Processes by which substances are transformed to one or several products are called chemical reactions. Chemical processes that occur in the presence of light, like sunlight, are called photochemical reactions. These processes can occur naturally or under controll..

1) Nature - Carbon dioxide is slightly acidic. It turns blue litmus paper red. During rainy season, blue litmus paper kept open in the laboratory slowly turns red, due to the presence of carbon dioxide in ai..

Policy decisions are already taken in India to undertake technology developments for alternatives to CFCs. Two CSIR laboratories - National chemical laboratory and Indian Institute of Chemical technology are working on this. Along with this, parameters for de..

The change in internal energy gives the heat change accompanying a chemical reaction at constant volume. However, most of the chemical reactions carried out in laboratories, are open to normal atmospheric conditions. A chemical reaction in a labora..

Enthalpy - The change in internal energy gives the heat change accompanying a chemical reaction at constant volume. However, most of the chemical reactions carried out in laboratories, are open to normal atmospheric conditions. A chemical reaction in a l..

2 SO 4 Sulphuric acid is used in large number of industries. It is called the "King of chemicals". Its important uses are: i) As an acid in laboratories and industries. ii) In storage batteries and lead accumulators. iii) In chemical industries for the prepar..

It has been seen that energy change occurring during the reaction at constant temperature and constant volume is given by internal energy change. However, most of the reactions in the laboratory are carried out in open beakers or test tubes, etc. In such cases, the reacting system i..