# For #4 It Is Asking Me What Is The Concentration On Oh Ions

br/gtFor #4 it is asking me what is the concentration on OH- ionsBie What is
OH – – log It
L sample of HCI is placed in a flask with a few drops of phenolphthalein indicator. If
PH – – log (
PH – 1.6
it takes 36.3 ml of a 0.235M NaOH solution to reach the endpoint, what is the concentration
of the HCI solution?
To calculate the
HCL +
NaOH
O
8.53 x 10-3 M
34. OML
34.3 ML
O
0.235 M
2 M
Example: What is
O
0.251 M
36.3 ml NaOH x IL x 0.235M NaOH
IL NaOH
* Jmod HCI
[H30′] = 10
1000mL
imol NaOH
[H30*] = 10
O
0. 158 M
34.3/ 1000 = 0368 x 0.235=0085305 – molarity, 0085305
[H30*] – 3.2
=modell = 10343 –
Example: What is th
4. What is the concentration of OH- ions in a solution that contains 3.5 x 10-4 M H20* ions? (O. 2506
Kw = [H30*] x
1.0 x 10-14M
[H30′] = 3.125
8.9 x 10-6 M
PH = – 108 [H30
PH = – log (3.12
3.5 x 10-4 M
PH = 3.51
8.9 x 10-3 M
ction 10.7: Re
2.9 X 10-11 M
acid + base gt; water+ salt
5. What are the products of this neutralization reaction: HCI + NaOH -?
rst two parts of th
and Hydrodroxid
d Hydroxides:
is and bases r
NaCl + H20
O NaH + CIOH
O NaOH + HCI
tions of hy
O No reaction
‘rite the f
6. What is the purpose of a buffer?
e two substancesScience