What is a displacement reaction

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.