for solcing this problem u shouod have knowledgeof range of ph indictor
litmus range-ph(5-8)
methyl orange(3.1-4.4)
phenopthalin(8.3-10)
now according to the above peoblem
oh- will be left having conc of .001 M
ph will come out to be 11
therefore it is better to use methyl orange
thanks and regards
sunil kumar
askIItian faculty