Question

s. When one adds a 0.10 M NaOH solution to a weak acid solution, a portion of the weak acid solution is neutralized. If 20.8 mls of a 0.10 M solution of NaOH is needed to completely (100%) neutralize 10 mLs of a weak acid solution, how many mls of the 0.10 M NaOH solution is needed to neutralize 50% of the weak acid solution? To neutralize 30% of the weak acid solution?

please show all work! The second pic is the formula i think you use but i am confused. Thanks!

Answer 1

Quesion: when one adds a 0.10 M NaOH solution to a weak acid solution, a portion of the weak acid solution is neutralized. If 20.8 mLs of a 0.10 M solution of NaOH is needed to completely (100%) neutralize 10 mLs of a weak acid solution, how many mLs of the 0.10 M NaOH solution is needed to neutralize 50% of the weak acid solution? To neutralize 30% of the weak acid solution?

M Sol: Gtiven Volume of Nach for 100 % noutaaliyotion (VI) € 20.8 mts. Strength of NGOH (Nm) = 010M Volume of weak acid (Ve) = 10 mbs First of all, we should know the strength of weak acid (N2) = ? . For calculating Nr. Vinire V2 N2 = N2 = - N, 20. 8 x o tp , 10.10 a 0.208 M Herite the strength of weak acid is 0.208m 2 VIN, For 100% neutralization of weak acid, the required amount of NaOH is 20.8 mls. V-N = V2 X Na. 20.8 x 0.10 = 10 x 0. 208 0 of weak acid for 100% heutralization . is - Ve N2 E x100 % - 1040208 * 100% 20.8 XOLO = 100% Scanned with CamScanner

@ For 50% hortialization of weak acid, the required amount of Nach = 50 x 20.8 mts. 100 € 10. A mis. V,N2 The percentage of neutraligahon was calulala by the method - V2.N2 x 100 %. Here (vi) - 10. A mts. rox 0.208 Now the equation = 1 | 10.4*0.10 J X100 % 20.5 X 100 % = 50% (l.es when the 10.4 mts of oolom Naoh/ added to the 10 mls of weak auid, the weak acid will neutralized 50% 6. For 30% heutralization of weak acid, the required amount of Naoh = 30 x 20.8 mis 100 = 6.24 mts. The porcentage of neutralization & Ve New VIN NO = 6.24 mlis. ranes are substitnted in ea rior0.2017 - Kloo 16.24x0.101 0.3 * 100 lices when the 30% li.e) when the 16.24 mbs of 0.10M Nooh added to the to mits of weak acid, the 130% / of weak acid nned will be heutralized, CS Scanned will be hem CamScanner