dissolving the zinc core and leaving behind the copper coating. We will figure out the percent composition from the mass of copper and zinc using titration and precipitation. Procedure: 1) First dissolve the zinc core of a penny and leave copper covering intact by applying four notches in the coin using a triangular file. 2) Place the penny in a 50 mL of a pre-determined concentration of HCl solution overnight. 3) Then determine the percent copper from the mass of copper. 4) Find the percent of zinc by precipitation
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Preparation Nitrosyl chloride can be prepared by the reaction of nitric oxide with chlorine: 2NO + Cl2 → 2ClNO Also‚ nitrosyl chloride is produced by the action of chlorine on sodium nitrate; or by the reaction of nitrosyl sulfuric acid with hydrochloric acid: NaNO3 + Cl2 → ClNO + NaClO2 ONHSO4 + HCl → ClNO + H2 SO4 Nitrosyl chloride also is obtained as a byproduct in the manufacture of potassium nitrate from potassium chloride and nitric acid: 3KCl + 4HNO3 → 3KNO3 + Cl2 + ClNO + 2H2O In the
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Analysis of Oxygen Bearing Organic Compounds James Matthew Jocson*‚ Gianvittorio Lanta‚ Chiqui Ann Llamado‚ Jeron Manaig College of Science Department of Biology University of Santo Tomas‚ Manila‚ Philippines Abstract Five oxygen-bearing organic compounds were given namely Methanol‚ 2-propanol‚ tert - butanol‚ formalin‚ and acetone. Different tests were done to each sample to differentiate their characteristics. These test were Dichromate test‚ Tollens Test‚ DNPH test‚ Iodoform Test‚ and Lucas
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Why is more than one accurate titration carried out? – To minimise error by getting accurate readings within 0.1-3 cm of each other. 7. Explain why hydrochloric acid is not used as a primary standard? – The exact concentration of any hydrochloric acid solution is not known‚ unless it is prepared from standard ampoules. Laboratory grade hydrochloric acid is not sufficiently pure. 8. Can any of the following be used as primary standards: NaOH‚ H2SO4‚ HNO3? Explain your answer. – A primary standard
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Objective: To determine relative molecular mass of a soluble base‚ X2 CO3 by carrying out an acid-base titration with the following reaction ‚ knowing the amount of hydrochloric acid used and the amount of substance Z used. Hypothesis: The X in substance Z is a group 1 element because substance Z is a soluble metal carbonate and would most likely be sodium or potassium because these elements are commonly used. Materials 100 cm3 beaker‚ 250 cm3 beaker‚ 250 cm3 volumetric flask with stopper
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available chemicals was the most effective at scarifying seeds to improve the rate of germination‚ and what concentration of the most effective chemical was the most efficacious. Ten seeds for each of the five chemicals hydrogen peroxide‚ glucose‚ hydrochloric acid‚ isopropyl alcohol and citric acid were soaked in the solution for approximately twelve hours then subsequently rinsed to remove residue of the chemicals. They were then planted in beds of cotton wool inside plastic containers
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For example‚ the electronic configuration of Cu+‚ Cu2+ and Cr3+ are respectively 3d10 4s°‚ 3d9 4s° and 3d3 4s°. m o .c y a d with the help of above. The following questions can be answered o t (i) Scandium (Z = 21) is a transition s element but zinc (Z = 30) is not. e i (ii) Copper (Z = 29) and silver (Z = 47) both have fully filled d-orbitals dthese u i.e.‚ (n - 1) d . why are elements are regarded as transition t s elements? . w (iii) Which of the d-block elements are not regarded as transition
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BACHELOR OF SCIENCE (HONS) BIOTECHNOLOGY YEAR 1 SEMESTER 1‚ 2 & 3 UDBB 1164 FUNDAMENTAL ORGANIC CHEMISTRY 0 EXPERIMENT 1 PROPERTIES OF HYDROCARBONS Introduction Hydrocarbons are compounds which contain only carbon and hydrogen‚ can be classified into several types‚ depending on their structure. Aliphatic hydrocarbons are divided into three classes: alkanes (e.g. methane‚ ethane and propane) have only single bonds‚ and are said to be saturated; alkenes (e.g. ethene and propene)
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tetroxide: N2O4 (g) 2NO2 (g) Decomposition of calcium carbonate: CaCO3 (s) CaO (s) + CO2 (g) Non-Arrhenius acid/base reaction: Gaseous hydrogen chloride and ammonia react: HCl (g) + NH3 (g) NH4Cl (s) IONISATION of strong and weak acids: Hydrochloric: HCl (g) + H2O (l) H3O+ (aq) + Cl־ (aq) Nitric: HNO3 (l) + H2O (l) H3O+ (aq) + NO3- Sulfuric: H2SO4 (l) + 2H2O (l) 2H3O+ (aq) + SO42־ Ethanoic: CH3COOH (s) + H2O (l) H3O+ (aq) + CH3COO־ (aq) Sources of sulfur and nitrogen oxides in the
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Method: place about 100cm3 of distilled water in a flask and add about one spatula of solid calcium hydroxide. Stopper the flask and shake well for one minute. Leave to stand for at least 24 hours. Titrate 10cm3 samples against 0.05 mol dm-3 hydrochloric acid solution using methyl orange as an indicator. Obtain enough results to calculate an accurate average‚ and then calculate the number of moles of calcium hydroxide solution in 1 dm3 of solution. RAW DATA Titration number | Final volume
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