Reference no: EM132424002

1: Human spinal fluid has a pH of 7.5

Approximately what is the H3O+ concentration of spinal fluid?

Express your answer using one significant figure.

2: About 21 % of the acid in a 0.10 M solution of a weak acid dissociates to form ions

a: What is the H3O+ concentration?

Express your answer using two significant figures.

b: What is the OH- concentration?

Express your answer using two significant figures.

c: What is the pH of the solution?

Express your answer using two decimal places.

3: Based on the Ka values in the table, rank the following solutions in order of decreasing pH: 0.10 M HCOOH, 0.10 M HF, 0.10 M H2CO3, 0.10 M HSO4-, 0.10 M NH4+

Rank from highest to lowest. To rank items as equivalent, overlap them

4: The ammonia/ammonium buffer system is used to optimize polymerase chain reactions (PCR) used in DNA studies. The equilibrium for this buffer can be written as NH4+(aq)??H+(aq)+NH3(aq)Calculate the pH of a buffer that contains 0.055 M ammonium chloride and 0.065 M ammonia. The Ka of ammonium is 5.6×10-10

Express your answer using two decimal places.

5: A buffer system contains 0.31 M NH4+ and 0.17 M NH3. pKa of NH4+ is 9.25.

a: How many moles of NaOH must be added to 1.00 L of this solution to increase the pH to 9.25?

Express your answer using two decimal places.

6: BaCO3+HI→

Express your answer as a chemical equation. Identify all of the phases in your answer.

a: H3PO4+KOH→

Express your answer as a chemical equation. Identify all of the phases in your answer.

7: Tums, a drugstore remedy for acid indigestion, contains CaCO3

.a: Write an equation for the reaction of Tums with gastric juice (HCl)

.Express your answer as a chemical equation. Identify all of the phases in your answer.