Explain how paper chromatography could be used to separate a mixture of different coloured inks
1 answer:
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Answer:
pH = 4.8
Explanation:
A buffer is formed by a weak acid (0.145 M HC₂H₃O₂) and its conjugate base (0.202 M C₂H₃O₂⁻ coming from 0.202 M KC₂H₃O₂). The pH of a buffer system can be calculated using Henderson-Hasselbalch's equation.
Measured volume = 10 ml
mass = 9.925 g
density = 0.9975 g/ml
density =
so actual volume =
= 
= 9.95 mL
Percentage Error =
x 100
=
x 100 = 0.5 % error
mass = 9.925 g
density = 0.9975 g/ml
density =
so actual volume =
Percentage Error =
=
Answer:
About 0.1738 liters
Explanation:
Using the formula PV=nRT, where p represents pressure in atmospheres, v represents volume in liters, n represents the number of moles of ideal gas, R represents the ideal gas constant, and T represents the temperature in kelvin, you can solve this problem. But first, you need to convert to the proper units. 215ml=0.215L, 86.4kPa is about 0.8527 atmospheres, and 15C is 288K. Plugging this into the equation, you get:
Now that you know the number of moles of gas, you can plug back into the equation with STP conditions:
Hope this helps!