"An acid is a substance that forms hydrogen ions when dissolved in water." This is an example of - O an Arrhenius definition
O a chemical change definition
O a Brønsted-Lowry definition
O an operational definition

Iknow #2 is d. i just need to know why

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.

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