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The aim of the courework is to find the unknow concentration of HCl

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Introduction

Aim: The aim of the courework is to find the unknow concentration of HCl Introduction Chemical procedure is used for determining the concentration of a solution. A known volume of a solution of unknown concentration is reacted with a known volume of a solution of known concentration (standard). The standard solution is delivered from a pipette so the volume added is known. This technique is known as titration. Often an indicator is used to show when the correct proportions have reacted. This procedure is used for acid-base, redox, and certain other reactions involving solutions. Making the standrad solution A stadard solution is a solution which the concentration is accurately known.the concertration is usely in mol dm . when making the standard solution it's in important that the correct mass is substanced acuratley and all of the solution successfully transferred to the volummetic flask. Uses of volumetic solution Volumetric solution can be used in many purposes, but it can also be used to find the following: * Concentration * Molecules mass of a substance * Percentage of an element present * Stoichiometry of an equation * Quality control Procedure Apparatus * Watch glass * Goggle * Balance * Volumtric flask * De-ioned water * Beaker * Glass rod * Teat pippette * Anhydrous sodium carbonate * Label * Spatual * Filter funnel * Bench mat Method 1. ...read more.

Middle

* Obtain a beaker ( which has been rinsed twice with de-ionised water) and a white tile. * Place the white tile under burette and then place the beaker on top of the white tile. * Next the burette casn be filled as close to 0.00 as possible. (make sure the tap is closed) * Fill the pippette with de-ionised water to clean any impurities away. * Using the pipette filler fill the pipette with your standard solutuion (sodium caronate) and pour it in the beaker. * Pour a couple of drops of methyl (orange) * open the for a few seconds at a time until the sandard solution changes from orange to pink. * lastly read the measurments of the hydrochloric acid in the burette and record the amount left. Burette: The precision of a burette makes careful measurement with a burette very important to avoid systematic error. When reading a burette, the viewer's eyes must be at the level of the graduation to avoid parallax error. Even the thickness of the lines printed on the burette matters; the bottom of the meniscus of the liquid should be touching the top of the line you wish to measure from. ...read more.

Conclusion

= 35.20g After getting the mass you take it away 36.60 - 35.20 = 1.40 Step 2: Find the RAM of Na CO Na = 23 mulitply by 2 C = 12 O = 16 mulitply by 3 = 48 So you add 23 + 23 + 12 + 16 + 16 + 16 = 106 Step 3: to find the number of moles in Na CO you divide 1.40 by 106 which you get 0.0132 moles Step 4: Next we find the concentration of Na CO soution you divide 0.01323 by 0. 025 which you get 0.0528 mol/dm Step 5: I need to balance the equation Na CO + 2HCl 2NaCl + CO +H O Step 6: After finding the concentration of Na CO we need to find the number of moles. So you do No of moles = concentration volume = 0.0528 0.025 = 0.00132 Step 7: In addition, we had to find the number of moles of HCl. To find this NO of moles of HCl = 0.00132 2 = 0.00262 Step 8:lastly you get the volume of HCl from the titration which is25.22, to give you final results HCl concentration = moles divided by volume dm 0.00264 = 1.046 = 1.050 mol/ dm 0.002522 ...read more.

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