Here are questions associated with Non-Buret Acid Base Titration Lab. |
Here are questions associated with Non-Buret Acid Base Titration Lab. |
Note: Neutralization (neutralized) reaction/equation is what reaction you are doing. Titration (titrated) is the laboratory process you perform. Often these two words/concepts are used interchangeably. |
1)You used phenolphthalein to determine when to stop adding acid/base to the original solution in the well (of the wellplate). What is the color of pH indicator in an acidic solution _______ Color of pH indicator in a basic solution ____________? 2) How many drops of HCl do you needed to add to the NaOH? to get a color change (neutralize the acid)? Does that number of drops make sense, explain? |
1) Write the balanced chemical reactions including phases of all neutralization reaction in this lab (please refer the direction step/section for each reaction). |
2)You used phenolphthalein to determine when to stop adding acid/base to the original solution in the well (of the wellplate). What is the color of the pH indicator in an acidic solution _______ Color of pH indicator in a basic solution ____________? |
3) How many drops of NaOH? did you need to add to get a color change for HCl ? __________ How many drops of NaOH? did you need to add to get a color change for H2SO4? _______ Does it make sense that you did not have same amount of drops for the two acids even though they had the volume (15drops) and Molarity (1.0M). Explain. |
3) How many drops of HCl did you need to add to the NaOH to get a color change (neutralize the acid)? Does that number of drops make sense, explain? |
4a) How many drops of NaOH did you need to add to get a color change for HCl ? __________ How many drops of NaOH did you need to add to get a color change for H2SO4? _______ |
4) Except for acetic acid in the vinegar, all the acid and bases are strong. What does "strong" (i.e. acid or base) mean with respect to what species are in your container. How does tht differ than "weak" acid/base? |
4b) Does it make sense that you did not have the same amount of drops for the two acids even though they had the same volume (15drops) and same Molarity (1.0M). Explain. |
5) Except for acetic acid in the vinegar, all the acid and bases are strong. What does "strong" (i.e. acid or base) mean with respect to what species are in your container. How does that differ than "weak" acid/base? |
5) The vinegar you used had a concentration of "5% acidity". Using your knowledge of "% acidity", determine what your %acidity was from your calculations. |
6) The vinegar you used had a concentration of "5% acidity". % acidity is calculated by: Assume Density of vinegar = 1.00g/ml, knowing molar mass of acetic acid and finding moles of acetic acid from neutralization stoichiometry, determine the %acidity for your vinegar sample. (show all work). |