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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) 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 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? _______
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?
6) The vinegar you used had a concentration of "5% acidity". % acidity is calculated by:
% acidity = (grams of acetic acid / grams of vinegar) x 100%.
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).