Part 1) The pH of an aqueous solution is measured as 1.91. Calculate the [H3O+]. Answer in units of M.
Part 2) Calculate the [OH−].
Answer in units of M

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Can someone me with 1 to 4 plz. fast

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true