Titrations

How many moles of Ca(OH)₂ are needed to neutralize three moles of HCl?

• 8

• 1.5

• 6

• 3

How will I ensure I get an accurate final end point?

• Be slow and careful 

• Repeat until you have 3 very similar titre

• Rinse the Burette

• Always use the same Pipette filler

If phenolphthalein turns bright pink, it indicates

• an acid 

• a base

• a neutral

A titration involves the chemical reaction between an analyte solution and the

• titrant

• titrator

• standard

• all of the above

Tags

NGSS.HS-PS1-5

Back titrations are used when

• the direct titration would be tediously slow

• the analyte is completely insoluble

• the end point cannot be visualized with any chemical indicators

• a front titration just won't do

The equivalence point is the

• theoretical halfway point of the reaction

• empirically derived completion of the reaction using phenolphthalein

• theoretical completion of the reaction

• the actual measurement based on the presence of the indicator

If a 40 mL solution of HCl required only 10 mL of NaOH titrant to reach the equivalence point, the relative molar concentration ratio (base:acid) is

• 1/4

• 1

• 1:1

• 4

Tags

NGSS.HS-PS1-7

What makes KHP a primary standard?

• available in highly pure crystals

• highly stable and can be dried of atmospheric moisture

• reacts precisely and reproducibly

• can be precisely massed and molecular mass known

• all of the above

In addition to neutralization, what other class of reaction occurs between KHP and NaOH solutions?

• combustion

• double replacement

• single replacement

• composition

If NaOH solution added to a solution at physiological pH raises the pH to the phenolphthalein end point (around pH 8.35), the acidity of the solution has

• increased 10x

• decreased 1x

• decreased 10x

• increased 1x