experiment 6 imGenereldnistry Fraturing Miasarnet Stanton et al. 74 right CENGAG

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experiment 6 imGenereldnistry Fraturing Miasarnet Stanton et al. 74 right CENGAGE Learning ime3 If a student used an iron scoopula, instead of a plastic one, to add the unknown metal to the HCI n: 2 solution, will it affect the calculated molar mass of the unknown metal? If so, how? Justify your jazzey answer with an explanation. ed from www.chegg.com Chegg Copyright @ CENC Experiments in Ge Edition: 2 sarahjazzoyd@yal Printed from www 4-900 mL of distilled water is added to 100 mL of 1.00 M HCL Calculate the IHO.] and the pH of the solution before any metal has been added to the solution. hegg opyright © CENGAGE Learning periments in General Chemistry ition: rahjazzey unknown metal. nted from www.chegg.comm 2 Calculate the [H,0.] and the pH of the solution after 990% of the HO+ has reacted with and

Explanation / Answer

3. If you have used iron scoopula to add the metal to the HCl solution and then stirred the solution mixture with it. The metal present in scoopula would dissolve in the HCl. The overall weight of the metal in solution would be higher then actual value and thus, the molar mass calculated would be lower than the actual value.

4. moles of HCl = molarity x volume = 1 x 0.01 L = 0.01 mols

molarity in 100 ml solution = moles/L = 0.01/0.1 = 0.1 M

[H3O+] = 0.1 M

pH = -log[H+] = -log[0.1] = 1

5. If 99% of HCl has reacted,

remaining [H3O+] = 0.1 - 0.099 = 0.001 M

pH = -log(0.001) = 3

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