PRELAB QUESTIONS (RESPOND ON A SEPARATE SHEET OF PAPER): 1. What hazards are ass

Question

PRELAB QUESTIONS (RESPOND ON A SEPARATE SHEET OF PAPER): 1. What hazards are associated with the following reagents? What precautions should you use when you working with these substances? (a) 3 M HNOs (b) 0.1 M AgNOs (c) 6 M NHs 2. What will you observe when you have a positive test for: (a) HCO3 (b) PO 3. Why should you use distilled water to rinse your test tubes between tests? 4. How could you distinguish between a precipitate of AgCI and Agl? at are the common household uses for the four consumer products being tested? Which anions are expected to be present in each? Wh Be sure to get the report from the course website and complete all sections.

Explanation / Answer

Q1:

(a) With Nitric acid following precautions should be taken to deal with:

(b) Silver nitrate decompose to produse oxides of nitrogen therefore use mask and gloves

(c) personal protective equipments are very much needed during work with ammonia ie safety goggles,gloves and emergency washing area. It is highly reactive with some metals so avoid direct contact like, halogens,acidsand hupochlorites.

Q2. we get the same observation for carbonate and bicarbonate ions

sub + dil Acid----- Acolourless gas ---- which turns lime water milky

the only difference is if we heat the bicabonat salt solution it gives condansation but carbonate dosn't

with ammonium molybdate phosphate ions give bright yellow precipitata

Q3 To avoid comman mineral like chlorids which are available in tap water

Q4 The colour of AgCl is white while the colour of AgI is dark yellow

Q5 comman salt, vineger, soap, etc

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