Core Practical 3 Lab

Correctly follows instructions to carry out the experimental techniques or procedures

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

• Prepares apparatus for titration:

1. Washes out burette with acid

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

3. Removes air bubbles from tap

4. Records initial burette level

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

6. Uses a white tile

7. Adds four drops of indicator

• Carries out titrations:

1. Titrates the alkali against the acid solution swirling the flask and with good control over the tap

2. Achieves drop wise addition near the end point

3. Reads titre to nearest 0.05cm³

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 (teacher to check one)

· Read from bottom of meniscus when using burette (teacher to check one)

· 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

· Collects all equipmentt at start to minimise walking around the lab once practical work

· Sets up work space in an organised fashion

· Wears safety goggles, (lab coats), throughout

· No spillages/deals with spillages appropriately with minimal fuss

· Keeps stoppers on bottles when not in use

· Fills burette at eye level with a filter funnel and safety glasses. Removes funnel.

· Discuss medical issues prior to practical work that may need considering (ie asthmatic/ epileptic…)

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

· Area cleared away properly & cleaned down without prompting