With prolonged strong heating, anhydrous magnesium sulfate eventually can decomp

Question

With prolonged strong heating, anhydrous magnesium sulfate eventually can decompose into Magnesium solid and various sulfur oxides. Find the MsDs for sulfur trioxide, SO_3, and answer the following questions: What is the CAs number for SO_3, what hazards does this material present, and what is the treatment for exposure to SO_3? You are given a crushed sample that is a mixture of limestone (CaCO_3), lime (CaO) and sand. The calcium carbonate is the only material present in the sample that will decompose when heated. You subject a 5.3563 g sample of the mixture to strong heating and after the sample reaches constant mass (no more mass is lost with additional heating), the sample weighs 3.2887 g. What is the percentage of calcium carbonate present in the original mixture? (fwt.CaCO_3 = 100.1 g/mol)

Explanation / Answer

CAS number for SO3 is 7446-11-9

SO3 is highly corrosive Very hazardous in case of skin contact. . Liquid or spray mist produces tissue damage particularly on mucous membranes of eyes, mouth and respiratory tract. Skin contact may produce burns. Inhalation of the spray mist may produce severe irritation of respiratory tract, characterized by coughing, choking, or shortness of breath. Severe over-exposure can result in death. Inflammation of the eye is characterized by redness, watering, and itching. Skin inflammation is characterized by itching, scaling, reddening, or, occasionally, blistering

In case of eye contact, eyes areto be immediatelt flushed with plenty of water for at least 15minutes.

In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing. In case of serious skin contact , wash with a disinfectant soap and cover the contaminated skin with an anti-bacterial cream.

If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.

in case of serious Inhalation, Evacuate the victim to a safe area as soon as possible. Loosen tight clothing such as a collar, tie, belt or waistband.

2. The reaction of decomposition of lime stone is

CaCO3-------<CaO+CO2

molar masses : CaCO3=100, CaO=56 and CO2=44

56 gm of CaO requires 100 gm of CaCO3

CaCO3+CaO+sand in the original sample= 5.3563 gm

CaO+Sand in the final sample aftet heating = 3.2887 gm

additional sample of CaO generated due to calcination of CaCO3= 5.3563-3.2887 =2.07 gm

56 gm of CaO is produced from 100 gm of CaCO3

2.07 gm of CaO is produced from 100*2.07/56 gm of CaCO3=3.69 gm

% CaCO3 in the sample = 100*3.69/5.3563 =68.89%

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