In: Chemistry
A buffer solution is formed by mixing 50mL of 0.30M HClO with 300mL of 0.20M NaClo. The ka for HClO is 2.9 x 10^-8.
1. Write the buffer reaction including states and excluding spectator ions.
2. Calculate the initial concentration of each buffer component.
3. Calculate the pH of the buffer - be sure to include validation if approximations are used.
1. HClO + NaClO
weak acid and its salt with strong base is called acid buffer solution.
HClO NaClO
M1 = 0.3 M2 = M1 = 0.2M M2=
V1 = 50ml V2 = 50+300 = 350ml V1 = 3000ml V2 = 300+50= 350ml
M1V1 = M2V2 M1V1 = M2V2
M2 = M1V1/V2 = 0.3*50/300 = 0.05M M2 = M1V1/V2 = 0.2*300/350 = 0.1714M
Ka = 2.9*10^-8
PKa = -logKa
= -log2.9*10^-8 = 7.5376
PH = PKa + log[NaClO]/[HClO]
= 7.5376 + log0.1714/0.05
= 7.5376 + 0.5354 = 8.073 >>>>answer