short term when it decomposes. Decomposition of PCB is caused by heat. When PCB decomposes‚ the products are much more immediately dangerous. These products include; Hydrochloric acid‚ Phenolics‚ and Aldehyde. Hydrochloric acid can be immediately dangerous to life an health‚ the IDLH is 50ppm. Phenolics or Carbolic acid can
Premium Oxygen Sulfuric acid Water
In 1952‚ a toxic smog covered London. This fog continued to blanket the city for four days. Although this is a short period of time‚ the smog had a fatal aftermath. This still continues today and affects the people who were exposed to the toxic fumes. There were many things that contributed to the way the smog started‚ ended‚ and how it became toxic. One main reason why the smog started and lasted so long was because of the weather. There was a high-pressure air mass stalled over the Thames
Premium Smog Sulfur dioxide Sulfuric acid
| | | |1. |Sodium Hydroxide [l] + Dilute hydrochloric|10.0 cm³ |10.0 cm³ |27.9 |29.3 |Exothermic | | |acid [aq] | | | | | | |2. |Sodium Hydrogen Carbonate [l] + Citric |10.0 cm³ |10.0 cm³ |28.5
Premium Sulfuric acid Thermodynamics Chlorine
previous chapter‚ it is an air pollutant as it causes acid rain. However‚ SO2 has important uses too: Bleaching wood pulp for the manufacturing of paper It is used as a food preservative as it kills bacteria Manufacturing of Sulphuric acid Contact Process (Manufacturing of Sulphuric Acid): Sulphuric acid is one of the most important chemicals in the industry since it has a role in the manufacturing of almost every product. Sulphuric acid is manufactured by a process called Contact Process
Premium Sulfuric acid Sulfur dioxide Sulfur
page-7) Procedure: 1. Rinse the pipette with the _____ N/M Mohr’s Salt solution and pipette out 10 ml of it in a washed titration flask. 2. Rinse and fill the burette with the given KMn04 solution. 3. Add one test-tube (15 ml) full of dilute sulphuric acid (2 N) to the solution in the titration flask. 4. Note the initial reading of the burette. 5. Add KMn04 solution from the burette till a permanent light pink colour is imparted to the solution in the titration flask on addition of the last single drop
Premium Sulfuric acid
□ A dilute solution has only a little of the substance in a lot of water. □ A concentrated solution has a lot of the substance in less water. If we take 100cm3 beakers of dilute acid and concentrated acid‚ there will be fewer acid particles in the beaker of dilute acid than in the beaker with concentrated acid‚ even though the volumes of the two solutions are the same. In chemistry‚ we count particles in terms of formula masses‚ so we describe concentration in terms of the number of formula
Premium Chemistry Chemical reaction Sulfuric acid
Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Wednesday 17 June 2009 – Morning Time: 2 hours Materials required for examination Nil Items included with question papers Nil Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
Premium Oxygen Sulfuric acid Copper
Separation of a Carboxylic Acid from a Neutral Compound by Extraction Reference: Smith‚ Chapter 2 (Acids and Bases) Introduction Carboxylic acids and phenols are two families of organic compounds that contain carbon‚ hydrogen and oxygen‚ and also react with water to yield an excess of hydronium ions over hydroxide ions. Pure water has a pH of 7‚ which means it has a hydronium ion concentration‚ [H3O+] of 10-7 M (M = molarity‚ moles/Liter). The hydronium ions in pure water come from the self-ionization
Premium Acid Acetic acid PH
Q. 1. During the electrolysis of molten lead bromide‚ which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains
Premium Electrochemistry Electrolyte Electrolysis
Chapter 10 ComMon Acids and Alkalis 10.1 Acids and Alkalis 1. Acids taste sour. Many fruits contain acids. 2. The three mineral acids commonly found in the laboratory are hydrochloric acid‚ sulphuric acid and nitric acid. 3. Alkalis taste bitter and feel soapy or slippery. 4. The common alkalis found in the laboratory are sodium hydroxide solution‚ potassium hydroxide solution‚ calcium hydroxide solution and ammonia solution. 10.2 Acid-Alkali Indicators 1. An acid-alkali indicator
Premium PH Acid Base