Core Practical 11 Lab 

Correctly uses appropriate instrumentation, apparatus and materials to carry out investigative activities, experimental techniques and procedures with minimal assistance or prompting. 

CPAC 2b - Carries out techniques or procedures methodically, in sequence and in combination, identifying practical issues and making adjustments when necessary.

·        Use digital balance appropriately, reading masses to 2dp

·        Make a solution up accurately in a standard flak using correct procedure:

1.  Transfer beaker contents to flask using a rod and funnel to avoid splashes

2.  Transfer beaker washings to the flask

3.  Wash rod and funnel to the flask

4.  Make up to the mark using deionised water

5.  Use bottom if the meniscus

6.  Stopper the flask

7.      Invert 20 x to ensure mixing

·        Prepares apparatus for titration:

1.  Wash out burette with acid

2.  Add acid to burette using a funnel at eye level with glasses on

3.  Remove air bubbles from tap

4.  Record initial burette level

5.  Pipet 25cm3 acid to a conical flask using a bulb pipette and safety filler

6.  Use a white tile

7.  Add four drops of indicator

·        Carry out titrations:

1.  Titrate swirling the flask and with good control over the tap

2.  Achieve drop wise addition near the end point

3.  Read titre to nearest 0.05cm3

·        Accurate use of pipette to measure 25.0cm3 portions

CPAC 4a – Makes accurate observations relevant to the experimental or investigative procedure.

·        Write down the exact burette value to 0.05cm3

·        Measure masses to at least 2dp’s

·        Obtain 2-3 concordant results

·        Read scales correctly on all pieces of apparatus 

·        Read from bottom of meniscus when using burette 

·        Use pipet and standard flask so that bottom of meniscus is on line

CPAC 3b - Uses appropriate safety equipment and approaches to minimise risks with minimal prompting.

·        Collect all eqpt at start to minimise walking around the lab once practical work

·        Set up work space in an organised fashion

·        Keep work space tidy and organised

·        Wear safety goggles, lab coat, throughout

·        No spillages/deals with spillages appropriately with minimal fuss

·        Keep stoppers on bottles when not in use

·        No / minimal prompts required re safe working

·        No / minimal prompts required re safe use of equipment and chemicals

·        Correct disposal of reaction mixture (reagents & products) at end of practical

·        Area cleared away properly & cleaned down (if needed) for following students without prompting