Name the following acids and bases and determine the pH when indicated. 9.5 time
ID: 534990 • Letter: N
Question
Name the following acids and bases and determine the pH when indicated. 9.5 times 10^-4 M HCI Name ________ pH _________ 6.3 times 10^-6 M KOH Name ________ pH _________ 2.0 times 10^-2 M HNO_3 Name ________ pH _________ 4.3 times 10^-3 M NaOH Name ________ pH _________ H_2SO_3 Name __________ HI Name _________ HCIO_3 Name __________ LiOH Name _________ H_3PO_4 Name __________ HBr Name _________ HNO_2 Name __________ HC_2H_3O_2 Name _________ HCIO_2 Name __________ H_2CO_3 Name _________ H_2SO_4 Name __________ HF Name _________Explanation / Answer
9.5 * 10-4 M HCl Name: Hydrochloric acid
pH calculations
HCl is a strong acid hence it will diassociate completely into H+ and Cl-
Molarity of H+ = Molarity of HCl = 9.5 * 10-4 M = [H+]
pH = - log ([H+]) = - log (9.5 * 10-4 M) = 3.02
HCl Name: Hydrochloric acid pH = 3.02
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6.3 * 10-6 M of KOH Name: Potassium Hydroxide or Caustic potash
KOH is a strong base
so it will completely diassociate into K+ and OH-
Molarity of OH- = Molarity of KOH = 6.3 * 10-6 M = [OH-]
pH = 14 - pOH = 14 - ( - log ([OH-]) ) = 14 - ( - log ( 6.3 * 10-6 M) ) = 14 - 5.2 = 8.8
KOH Name: potassium hydroxide pH = 8.8
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2 * 10-2 M HNO3 Name: Nitric acid
pH calculations;
Nitric acid is a strong acid so it will diassociate completely into H+ and NO3-
Molarity of H+ = Molarity of HNO3 = 2 * 10-2 M = [H+]
pH = - log ([H+]) = - log ( 2 * 10-2 M) = 1.7
2 * 10-2 M of HNO3 Name: Nitric acid pH = 1.7
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4.3 * 10-3 M NaOH Name: sodium hydroxide
NaOH is a strong base and will diassociate completely into Na+ and OH-
Molarity of OH- = Molarity of NaOH = 4.3 * 10-3 M = [OH-]
pH = 14 - pOH = 14 - ( - log ([OH-]) ) = 14 - ( - log ( 4.3 * 10-3 M) ) = 14 - 2.37 = 11.63
NaOH Name: sodium hydroxide pH = 11.63
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H2SO3 Name: sulphurous acid
HClO3 Name: chloric acid
H3PO4 Name: Phosphoric acid
HNO2 Name: Nitrous acid
HClO2 Name: Chlorous acid
H2SO4 Name: Sulphuric acid
HI Name: Hydrogen Iodide
LiOH lithium hydroxide
HBr hydrogen Bromide
HC2H3O2 Acetic acid or Ethanoic acid
H2CO3 Carbonic acid
HF Hydrogen flouride
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