4. pH of the blood is 7.4. The organism uses bicarbonate buffer to maintain the narrowly defined value. Calculate how much of NaHCO3 should be added to 1 L of solution at a concentration of
0.250 mol/L of H2CO3 (PKA = 6.35) to maintaining of blood pH.
[2.81 mol]
Someone know how to do this exercise?

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.