an acetic acid buffer containing 0.50 m ch3cooh and 0.50 m ch3coona has a ph of 4.74. what will the ph be after 0.0020 mol of hcl has been added to 100.0 ml of the buffer?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium