Core practical 2 Lab

Correctly follows instructions to carry out the experimental techniques or procedures

CPAC 2a - Correctly uses appropriate instrumentation, apparatus and materials (including ICT) to carry out investigative activities, experimental techniques and procedures with minimal assistance or prompting.

· Dissolve 2.5g of solid in 100cm³ water in a beaker – (reading balance to 2dps teacher check)

· 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

· Prepare 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 alkali 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 the alkali against the acid solution 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

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 at least one reading)

· 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

· 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