Name: |Date:| Exp 1: Observations of Chemical Changes|Lab Section: | Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl| H12|White and bubbled slightly and settled down to smaller smaller bubbles| B.|HCl + BTB| H11|Golden yellow; looked darker under the black paper| C.|NH3 + BTB|H10 |Dark blue| D.|HCl + blue dye| H9|Greenish color| E.|Blue dye + NaOCl| H8|Blue and lighter than NH3+BTB solution color| | with the 1 drop of HCl| H8|Turned blue green
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mixture for about 10 mins. If needed‚ add more water to maintain constant volume of solution while boiling. Test the vapour at the neck of the flask with a moist strip of red litmus paper. If ammonia is still present the paper will turn blue and heating should continue until the litmus paper no longer detects ammonia. Cool the flask once completed. 7) Rinse and fill a burette with standard hydrochloric
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urea-methanal c. milk of magnesia‚ soap‚ vinegar‚ window cleaner d. carbon monoxide‚ hydrogen‚ methane‚ nitrogen (8 marks) 2 3. HKCEE 1996 Q6b A‚ B‚ C and D are four unlabelled bottles‚ each containing one of the following reagents: 2M ammonia solution‚ 2M ethanoic acid‚ 2M hydrochloric acid‚ 2M nitric acid The following scheme is used to identify the four reagents: (i) ? Explain What is the reagent in bottle A? Explain why this reagent turns red litmus paper blue. (ii) What
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lot like the first definition we gave‚ where an acid breaks up and releases/donates a hydrogen ion. This newer definition is a little bit more detailed. Scientists used the new definition to describe more bases‚ such as ammonia (NH3). Since bases are proton acceptors‚ when ammonia was seen accepting an H+ and creating an ammonium ion (NH4+)‚ it could be labeled as a base. You didn’t have to worry about hydroxide ions anymore. If it got the H+ from a water molecule‚ then the water (H2O) was the proton
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which is 0.613 mm/min. Thus the lighter the molecular weight‚ the faster is the rate of diffusion. INTRODUCTION As we open a household ammonia it will not take that long before the smell of it occupies the whole room. The gaseous molecules travel quickly and mix with the molecules in the air which makes it possible for people to immediately smell the ammonia as soon as it is opened. Such process is known to be the diffusion (Myers‚ Oldham and Tocci‚ 2006). Gases tend to diffuse rapidly with each
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and it was due to me neglecting the water level. All of the other fish in both batches survived. 6. Study the data you collected. Describe the occurrences of ammonia‚ nitrite‚ and nitrate in your tank. I cycled the tank during weeks 3 to 7. First‚ there was ammonia‚ then nitrite‚ and then nitrate. Currently‚ the ammonia and nitrite levels of my tank are 0. 7. Study the data you collected. Why is the population in
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majority of chemical compounds are organic. S.No | Name of the chemical compound | Formula | 1 | Acetic acid formula | CH3COOH | 2 | Hydrochloric acid formula | HCl | 3 | Sulfuric acid formula | H2SO4 | 4 | Acetate formula | CH3COO- | 5 | Ammonia formula | NH3 | 6 | Nitric acid formula | HNO3 | 7 | Phosphoric acid formula | H3PO4 | 8 | Sodium phosphate formula | Na3PO4 | 9 | Calcium carbonate formula | CaCO3 | 10 | Ammonium sulfate formula | (NH4)2SO4 | 11 | Carbonic acid formula
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CHEMISTRY PRACTICAL NOTES - SALT ANALYSIS S.No. | EXPERIMENT | OBSERVATION | INFERENCE | 1(a) | Noted the colour of the salt | BluePale greenGreenPale pinkColourless | May be Cu2+May be Fe2+May be Ni2+‚ Cu2+May be Mn2+Absence of Cu2+‚ Fe2+‚ Ni2+‚ Cu2+‚ Mn2+ | (b) | Noted the physical state of the salt | (i)Amorphous(ii)crystalline | May be CO32-May be Cl-‚ Br-‚ SO42-‚ NO3- | 2 | Action of heat:The given salt is heated in a dry test tube. | (i)Reddish brown vapours(ii)Crackling sound(iii)Yellow
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What is observed? A B C D 2 a colourless layer below a purple layer a colourless liquid with the purple crystal unchanged a purple layer below a colourless layer a uniformly purple solution A student adds aqueous sodium hydroxide or aqueous ammonia to aqueous solutions of four different metal compounds. Which solution contains Zn2+ ions? add a few drops of NaOH(aq) ppt ppt ppt no ppt add excess NaOH(aq) ppt dissolves ppt dissolves ppt no ppt add a few drops of NH3(aq) ppt ppt no ppt no ppt add
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turned a thick brown color – almost like chocolate milk. K. AgNO3 + NH3 E5 The reaction was clear. after exposure to bright light I sat this outside to get direct sunlight. It turned dark brown and it looked as though the silver nitrate and ammonia separated on the paper towel. L. NH3 and CuSO4 G5 The reaction was a cloudy light blue color. With time it slowly separated into white/blue segments. Part F: Testing of
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