Illustrated Guide to Home Chemistry Experiments

196 DIY Science: Illustrated Guide to Home Chemistry Experiments

FIGURE 11-1:

Using a pH meter to determine

the pH of a solution

TABLE 11-1: Determine the effect of concentration on pH—observed and calculated data

Solute

Beaker #1

(1.0 M)

Beaker #2

(0.1 M)

Beaker #3

(0.01 M)

Beaker #4

(0.001 M)

Beaker #5

(0.0001 M)

Beaker #6

(0.00001 M)pK

A. Hydrochloric acid____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___

B. Sulfuric acid____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___

C. Acetic acid ____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___

D. Sodium hydroxide____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___

E. Sodium carbonate____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___ pH____.___

RQEWEvI UESTIOnS

q 1 : Chart pH against concentration for all five compounds on one piece of graph paper. What do you conclude about the effect of
concentration for a strong acid (hydrochloric acid or sulfuric acid) versus a weak acid (acetic acid) and for a strong base (sodium
hydroxide) versus a weak base (sodium carbonate)?