Answer:
pH of buffer is 4.81
Explanation:
The reaction between HCl and sodium acetate will product acetic acid. The presence of weak acid (acetic acid) and its salt will make a buffer.
The reaction will be:

Thus one mole each of HCl and acetate will give one mole of acetic acid.
The moles of HCl present = molarity X volume = 0.452 X 0.204 =0.092
moles of acetic acid formed on reaction of HCl with acetate = 0.092
Initial moles of sodium acetate present = molarity X volume = 0.4X0.5 =0.2
moles of sodium acetate left =0.108 mol
the pKa of acetic acid =4.74
The pH of buffer is calculated using Henderson Hassalbalch's equation :
pH = pKa + log![\frac{[salt]}{[acid]}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Bsalt%5D%7D%7B%5Bacid%5D%7D)

Answer:
B
Explanation:
This is because conductivity depends on the mobility of electrons.
Answer:
1.352 M
Explanation:
Molarity is equal to the moles of the substance divided by the volume in Liters. First convert mL to L. 500.00 mL is 0.50000 L. Divide 0.6762 by 0.5 and remember to keep a maximum of 4 significant figures. :)
Density = mass / volume
D = 5.2 / 0.117
D = 44.44