A student wanted to prepare 1 liter of 0.01M, PH=3, Buffer from a weak acid (HA). To do so he had 1M HA Pka=2.3 and 1M of NaOH
solution. Unfortunately, the water he had used were found to be
contaminated and became to be a 0.5mM HCl solution (without his
knowledge). What will be the PH of the Buffer in these terms?

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

In which reaction is precipitation occurring?

Glucose (c6h12o6) is an important biological molecule. (round the answer to nearest hundredth.) what is the percent by mass of carbon in glucose?