Instructions You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning. If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit. This assignment must be submitted no later than November 22nd‚ 2011. 1. What is a true solution? Explain why the solute does not settle out of a solution. Is it possible to have one solid dissolved in another? Explain. In metals it would
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= + l.51V The contents of many reducible substances can be determined directly or indirectly by the permanganate method. The titration reaction of permanganate method should be carried out in sulfuric acid (H2SO4) solution. Because nitric acid (HNO3) is of oxidization‚ and because hydrochloric acid (HCl) is of reduction‚ they are unavailable to adjust the acidic concentration of solution. In general‚ the available concentration of H2SO4 is 1 c( H2SO4)=1~2molL-l. If the acidic concentration is too
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Experiment 2 Preparation of Primary Standard solutions and Standardizing Acid and Base solutions Objectives: The objective of this experiment is: 1- To prepare two primary standard solutions‚ KHP and Na2CO3 2- To standardize a sodium hydroxide solution using the prepared primary standard KHP. 3- To standardize a hydrochloric acid solution using the prepared primary standard Na2CO3. 4- To calculate the concentration of an unknown acid or base. Introduction A primary standard is a standard that is accurate
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become attracted to the positively charged cation. In terms of the solubility‚ the formation of a complex lowers the concentration of the cation in the solution. In this experiment‚ there are 3 parts need to be done which is complex formation‚ weak acids and bases and precipitation reaction. During complex formation experiment‚ student needs to observe the different reaction occur when adding ammonia or sodium hydroxide in small quantity and in excess. At the second part‚ student needs to measure the
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1 The Effect of Molecular Weight on the Rate of Diffusion of Substances1 Alexander Ken Libranza Group 1 Sec. A – 1L March 6‚ 2012 A scientific paper submitted in partial fulfillment of the requirements in General Biology I laboratory under Prof. Cheryl M. Talde‚ 2nd sem.‚ 2011-2012. 1 2 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using two tests: the glass tube test and the agar-water gel test. In the glass tube set-up‚ two cotton plugs soaked
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1 a The diagram shows the parts of a hydrogen atom. [pic] Use words from the list to label the diagram. electron group nucleus symbol (2) b Hydrogen can be used as a clean fuel for cars. i When hydrogen burns in air‚ it reacts with another element. Complete the word equation for this reaction. hydrogen + ................... → water (1) ii Suggest one reason why hydrogen is called a clean fuel. (1)
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in the Buchner funnel‚ turn the water on and wet the filter paper with the acid wash. 2. Find the Mass of the Alloy • Find the mass of the empty beaker and then place the silver alloy in the beaker and weigh that. Subtract the mass of the beaker from the mass of the beaker with the alloy in it to get the mass of the sample. 3. Dissolve the Silver • Put the alloy in a beaker‚ put 10-mL of 6 M nitric acid in the beaker‚ place a watch glass on top of the beaker and place on the hot
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orange by coupling diazotised sulphanilic acid with N‚N-dimethylaniline. Materials (Chemicals) Sulfanilic acid‚ 2.5% aqueous sodium carbonate solution‚ sodium nitrite‚ concentrated hydrochloric acid‚ N‚N-dimethylaniline‚ glacial acetic acid‚ 10% aqueous sodium hydroxide‚ saturated sodium chloride solution Apparatus 50 mL Erlemeyer flask‚ 250 mL beaker‚ test tube‚ hot plate‚ Buchner funnels Procedure In a 50 mL Elermenyer flask 1.2 g of sulfanilic acid and 12.5 mL of 2.5% aqueous sodium carbonate
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chemical equation that represent those microscopic events. 5. To learn how to measure the volume of a liquid using a buret. Prelab Questions: 1. Calculate the number of moles in 2.65g of zinc. 2. Calculate the number of moles of hydrochloric acid in 37.5mL of a 3.00M HCl solution. 3. Calculate how many moles of HCl are required to react with 0.244 moles of zinc. Procedure: 1. Put on safety equipment. 2. Label small glass vial so your group can identify it later
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was a chemical change‚ and also to see what type and why that change occurred. DATE TABLE 1: Chemical Reactions Well Chemical #1 ( 4 drops) Chemical # 2 (4 Drops) Observations Chemical Change (Y/N) A1 NaHCO3 SodiumBicarbonate HCl Hydrochloric Acid Bubbles yes A2 NaOCl Sodium-Hypochlrite Kl Potassium Iodide Observation 1: None Add 2 drops of solution Observation 2: Solution turned blue Yes A3 Kl Potassium Iodide Pb(NO3)2 Lead Nitrate Turned Yellow Yes A4 NaOH Sodium Hydroxide C20H14O4
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