1. how to prepare an HNO3 solution (50ml) with a concentration of 15 mM from 70% HNO3 (density: 1.42g/ml) 2. what is the molar concentration of Pb2+ (15 ppb)

3. What is the pH of acetic acid (10 mM, ka = 1.8x10^-5)

4. How to prepare a 2L sodium phospate (50 mM, pH 7.4)

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

You are to give ampicillin with a recommended dose of 25mg/kg to a child with a mass of 29kg. if stock on hand is 250mg/capsule how many capsules should be given?

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?