If anyone could pls give me the answer

In 2002, the rare earth elements mine in mountain pass, california was closed because

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

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.