EXPERIMENT 2: COMMON-ION EFFECT AND BUFFERS MARVILE REA R. FERRER1 1DEPARTMENT OF MINING‚ METALLURGICAL & MATERIALS ENGINEERING‚ COLLEGE OF ENGINEERING UNIVERSITY OF THE PHILIPPINES‚ DILIMAN‚ QUEZON CITY 1101‚ PHILIPPINES DATE SUBMITTED: DECEMBER 13‚ 2012 DATE PERFORMED: DECEMBER 07‚ 2012 ______________________________________________________________________________________________________________ INTRODUCTION Monitoring the pH range of a laboratory reaction or a process is very
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activation energy (Ea) of a reaction © KCl http://hk.geocities.com/fatherofchemistry Objective To determine the activation energy for the reduction of peroxodisulphate(VI) ions. S2O82-‚ by iodide ions I-‚ using a ’clock’ reaction. Principle The equation for reduction of S2O82- by I- is: S2O82- + 2I- → 2SO42- + I2 The formation of iodine is ’monitored’ by small & known amount of thiosulphate ions‚ S2O32-:
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catalyst in the form of a metal ion affect the rate of reaction in an iodide clock reaction with potassium peroxydisulphate ions? Background When peroxydisulfate ions (S2O82-) react with iodide ions (I-) in the presence of a starch indicator‚ they produce a dark blue solution. Reaction (1) S2O82- + 3I- I3- + 2 SO42- (peroxydisulfate ion) (iodide ion) (iodine ion) (sulfate ion) To determine the rate law for this reaction a series of changes in the concentration
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1. When glucose‚ C6H12O6‚ is completely oxidized with excess oxygen‚ what are the products? A. H2O2 and CO2 B. H2O and CO2 C. H202 and CO D. H2O and CO 2. Which ion may form a scummy precipitate with ordinary soap? (soap has a negative charge) A. HCO3- B. CO32- C. Na+ D. Ca2+ 3. An element forms a basic oxide with the formula XO and a hydride with the formula XH2. The hydride reacts with water to give hydrogen gas. The element X could be? A. K B. Ca C. N D. O 4. Which metal reacts with concentrated
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. ~.. r .. .‚III/!I.. ‚• •f t . ‚.‚;;;‚UUft Y f__ _ P_RO_O_O_c_1 PDS: 1-16 _DA_T_A_S_f5l~_T GU_IT_erl_t: SUperseI &10 l-10 Neme‚‚ . _ nrkc Gnphlte Anoryhout Gnphite Ctey Siticr Tdc Ilcrtrin ’ . -‚ _ OSHApcl CAS# . ‚. N.iosL 77t242-S 2.5 2.5 778?‚42-5 2‚5 2.5 [5’15" l?32-58-57 t4g0g60-? 0.051o lI 14t0?-96-6 2.0 2.0 9004-53-9 "Retpirablc fraction - .... ACSF t{v 2.5 2..5 l0 0.I 2.0 _ _‚ _ in mluesacprcsscd mg/m3 TotalDust I Respirablc dust IEYSfCIi
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We learning about how ions dissolve in water and also how dissolved ions of different compounds react with each other and finally examine the final product for the presence for ions. Materials- Sheet of Paper Lead (II) Nitrate Potassium Iodide Deionized Water Filter Paper Charcoal Matches Equipment- Clean dry spatula Small Beakers Glass stirring rod Ring stand Funnel Tweezers Bunsen Burner Small Test Tubes Safety- During this lab we are dealing with some dangerous chemical including Lead Nitrate
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Excretion. a) excretion is the removal or metabolic waste from the body. Metabolic waste consists of waste substances that may be toxic or are produced n excess by reactions inside cells. b) Explain the importance of removing metabolic wastes‚ including carbon dioxide and nitrogenous waste‚ from the body. The are many substances that need to be excreted - almost any cell product that is formed in excess by the chemical process occurring in the cells must be excreted. However there are two
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produced when certain metallic ions are vaporized. Metallic Ion Color in Flame Na+ Light Orange K+ Pink / Orange Li Red Ca2+ Dark Orange Sr2+ Red Cu2 Green Co+2 Salmon Pink Ammonium Dichlorate Orange Sparks K2CR2O7 Orange Fe+1 No Reaction NaCl Orange Strantium Chloride Scarlet Red Ni+2 Dark Orange Copper Sulfate (solid) Green Fe+2 No Reaction Sn+2 Orange Zn+
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salts when reacted with (NH4)2CO3. The principle of periodicity applied to the results of this series of experiments. It helps‚ in trying to see the periodic pattern‚ to know the pattern that results when we do a separation and analysis of all metal ions. PROCEDURE Procedure A 1. 2 drops of 6 M HCl was added to 1 ml of the mixture of the metal cations. 2. The suspension was centrifuged for 1 minute as ppt. of chloride was formed. 3. 1 additional drop of 6 M HCl was added to the clear
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What observation supports the formation of the Cu2+ ions in the solutions? The 15mL of nitric acid and the heat from the Bunsen burner supports the formation of the Cu2+ ion. Why was it important to perform this reaction in the fume hood? It is important because the chemicals produce a toxic gas. Is there any copper metal left after you have completed this step? If not‚ where is the copper? No‚ there is no copper left. It dissolved in the nitric acid solution. Did you initially observe the formation
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