The pH of a 0.25 M aqueous solution of HF at 25°C is 2.03. What is the value of Ka for HF?     3.7 x 10-2 2.4 x 10-1 9.3 x 10-3 3.5 x 10-4

The Ka of acetic acid (HC2H3O2) is 1.8 × 10-5 . What is the pOH at 25.0 °C of an aqueous solution that is 0.100 M in acetic acid?  choice 1.75 2.87 8.32 11.13 12.06

What is the pH of a solution containing 0.10 M cyanide ion, CN1-? CN1- + H2O < === > HCN + OH1-     Kb of CN1- ion = 1.6 x 10-5

What is the pOH of a 0.50 M solution of polyprotic acid H3X with K1 = 2.5 x 10-4, K2 = 5.6 x 10-8, and K3 = 3.0 x 10-13?

What is the K w of pure water at 70.0°C, if the pH is 6.650?     5.02 x 10 -14     1.00 x 10 -14     5.50 x 10 -14     2.24 x 10 -14     2.24 x 10 -7

= O ACIDS AND BASES Making qualitative estimates of pH change Each row of the table below describes an aqueous solution at 25 °C. ? The second column of the table shows the initial components of the solution. Use the checkboxes in the third column to explain the type of the initial solution. The fourth column describes a change in the solution. • Use the fifth column to predict how the change in the solution will change its pH. solution initial components A B C D H₂O, HCIO4 H₂O H₂O, HCIO4 Explanation H₂O Check initial type (check all that apply) acidic basic neutral acidic basic neutral acidic basic neutral acidic basic neutral change add NaOH add KOH add Na C104 add KI effect of change on pH (check one) X 10 0 С pH higher pH lower pH the same pH higher pH lower pH the same pH higher pH lower pH the same pH higher pH lower pH the same S #tv MacBook Air

Calculate the pH of a 0.859 M NaF solution. Assume Ka(HF) = 1.0 x 10-4

Calculate the pH of a solution that is 0.66 M HF and 1.00 M KF. к, 3 7.2 х 10-4 pH =

What Is the pH of a solutlon of 3.7 M HBr? A -0.651 B) -0.748 0.568 D) -0.568 E 0.748

name nitrous acid acid hydrofluoric acid 0.1 M KF solution 0.1 M NaNO2 0.1 M NH4Br Ka HNO2 4.5 x 10 0.1 M CH3NH3Cl formula HF -4 6.8 × 10-4 Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on. X PH choose one choose one ✓ choose one choose one base S K₂ methylamine CH₂NH₂ 4.4 × 10 2 -4 ammonia NH3 1.8 × 10-5 name formula