1034 ppm‚ with a standard deviation of 2.4495. The results indicate that the unknown solution can be considered as hard water. Introduction The hardness of water is defined in terms of its cation content‚ which includes calcium‚ magnesium‚ iron‚ zinc‚ and other polyvalent metal ions. These metal ions interfere with the use of the water for many applications. For example‚ these ions diminish the effectiveness of soap and detergent for cleansing operations; they diminish the drinking quality of
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experiment where zinc reacts with hydrochloric acid in order to find out the number of moles and atoms of zinc reacted. This can be accomplished by weighing the sample before and after the reaction with hydrochloric acid. Data: Material Mass in grams (g) Initial mass of dry beaker 49.37 Initial mass of dry beaker + zinc 51.03 Initial mass of zinc 1.66 Final mass of beaker + zinc 50.40 Final mass of dry beaker 49.36 Final mass of zinc 1.04 Observation: We placed the zinc inside the
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sample | Metal fizzed when dissolved in HCl | Volume of HCl | 100 mL | Initial Temperature | 220 C | Mass of Mg | 0.1485 g | Part B Calculations Tf from graph | 50 C | Mass of HCl | 100 g | ∆TCW for HCl | -2092 J | qHCl for solution | -204.4 J | qCal for cup | -2296.4 J | qRXN | -47594 J | ∆HRXN for Mg | | NET REACTION: 2HCl(aq) + Mg(s)→MgCl2(aq) + H2(g) Part C Description of sample | | Volume of HCl | 100 mL | Temperature of HCl | 220 C | Mass of MgO | 0.5052 g |
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into contact with the solution containing phenolphthalein and base in the receiving flask‚ disappear more slowly near the endpoint? (2I) At the start of the titration‚ the NaOH solution in the flask will be pinkish and the pH is quite high. As HCl drops are added‚ the indicator colour will change momentarily to colourless as the pH is lower in the area around the drop(s). As the endpoint nears‚ the clear colour disappears more slowly as the solution has a lower pH than when the titration started
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measured by balance. While the reaction of eggshell with acid occurs‚ prepare the buret and clamp for titration. Make sure they are clean. Pour NaOH solution into the buret to the ’0’ level. Make sure all of the eggshell reacted with the HCl. If not‚ you can help the reaction by using the baguette. Put two drops of phenolophateine into each beaker using the plastic pipette. Take the first beaker and titrate the
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to experimentally determine the molar mass of carbon dioxide (CO2) by measuring its volume and calculating its mass. CO2 which we will measure will arise as a product of a chemical reaction between Calcium Carbonate (CaCO3) and Hydrochloric acid (HCl) as it is shown in the chemical equation above. Once we find out the volume of the compound which molar mass we want to determine‚ it will be easy to calculate the number of moles by using the following formula; pV=nRT * p is pressure in Pa‚
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complete the assignment in the given interval of time‚ can work for longer hours without any break. My lifestyle is very simple. 4) The main turning point of my life is when I was blessed to join HCL Info Systems Pvt Ltd. 5)I have work experience more than 1 year. right now i am working in HCL Info Systems Pvt Ltd and my designation is Hardware and Network support services since March 27th 2010. As a Technical Service for Customer Support where resolve the issues of the customer on the call
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molar NaOH solution. 2. Record volume. 3. Measure out between 20 milliliters and 40 milliliters of the unknown HCl solution. 4. Record volume. 5. The amount of unknown HCl is then added to the 100-milliliter Erlenmeyer flask. 6. Add two drops of the indicator‚ phenolphthalein‚ to the acid in the flask. 7. Using the slider on the right hand side‚ add NaOH to the HCl in the Erlenmeyer flask (This action is known astitrate). Add the indicator until the color of the indicator turns
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with symbol W and 109 neutrons c) the +3 ion with the symbol Ga and 39 neutrons 8. Name the following compounds: a) CuCl2 b) Fe(NO3)3 c) AlI3 e) NiSO3 f) BaCO3 g) i) XeF4 j) H2SO4 (aq) k) HNO3 (aq) l) LiBr m) ZnO n) Au2S3 o) N2O4 p) HCl (g) q) LiCN r) KOH s) Li3N t) FeO PCl3 d) Ca3(PO4)2 h) NaNO2 9. Give the
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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 Tuesday 6 November 2007 – Morning Time: 2 hours Question Leave Number Blank 1 2 3 4 5 Materials required for examination Nil Items included with question papers Nil 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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