A buffer solution contains 0.060 kmol m-3 ammonium chloride and 0.040 kmol m-3 ammonia. How many mL sodium hydroxide can be added to 50 cm-3 of the buffer solution to maintain its buffer effect? Hint: As a rule of thumb one can say that a buffer is still effective if the ratio cHA cA - is larger than 1 10 or below 10 1 (depending on the buffer system). HA refers to an acid and Ato its corresponding base.