Learning Objectives: To be able to read titration questions and understand the information that they contain.

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Presentation transcript:

Learning Objectives: To be able to read titration questions and understand the information that they contain

Reading the Questions Many people have difficulties in getting the important information out of the questions. You have to know HOW to read these questions. The first thing to do is to identify the acid and the alkali used. The names will be in the question and the formulae will be in the equation. Possible Acids Possible Alkalis Hydrochloric Acid, HCl Sodium Hydroxide, NaOH Sulphuric Acid, H 2 SO 4 Sodium Carbonate, Na 2 CO 3

Step 1 Find the numbers that fit with the acid and the alkali. What you want to know will always be the same. There is a table that you can fill in. The table always looks the same. Try to fill in as much as possible. AcidAlkali Concentration (mol.dm -3 ) Volume (dm 3 ) Number of moles

Calculate the volume of 0.2 mol.dm -3 sodium hydroxide, NaOH, that will neutralize 20 cm 3 of 0.25 mol.dm -3 hydrochloric acid, HCl, according to the equation: NaOH +HClNaCl+H 2 O AcidAlkali Concentration (mol.dm -3 ) Volume (dm 3 ) Number of moles Hint Write the information from the question in the table. Show also the variables you don’t have in the question

0.2 mol.dm -3 Calculate the volume of sodium hydroxide, NaOH, that will neutralize of hydrochloric acid, HCl, according to the equation: NaOH+HClNaCl+H 2 O Acid (HCl) Alkali (NaOH) Concentration (mol.dm -3 ) Volume (dm 3 ) Number of moles 0.2 mol.dm mol.dm cm dm -3 Click on the cells in the table to see if you can get that piece of information from the question.