Astudent has 10 ml of a solution that might contain any or all of the following cations at 0.01 m concentrations: mn2+, ba2+, ag+ , and cu2+. addition of 10 ml of 1 m hcl causes a precipitate to form. after the precipitate is filtered off, 1 m h2so4 is added to the filtrate and another precipitate forms. what is the second precipitate

For the answer to the question above,
Addition of HCl causes a precipitate to form: 
Ag+ & Cl- -- AgCl a white ppt 

H2SO4 is added to the supernate another precipitate forms: 
Ba+2 & SO4-2 --> BaSO4 a white ppt 

a solution of NaOH is added to the supernatant liquid until it is strongly alkaline. No precipitate is formed: 
no Mn+2 & no Cu+2 which would have ppt as hydroxides
I hope this helps you.

What does that mean you dum bum

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.