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)

the answer is a and have a great day

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

a