making indicators

Aim: To make acid-base indicators using everyday substances

Equipment:

• red cabbage 
• tea
• beetroot
• turmeric
• cranberry juice
• a beaker
• water
• tripod
• Bunsen burner
• gauze mat
• 1.0 mol L-1 Hci and 1.0 L-1 mol L-1 NaOH.

Method

1. for the cabbage and beetroot. Chop the cabbage into small pieces until you have enough to fill 2 cups place the cabbage into a large beaker and add water to cover the cabbage, boil over a Bunsen burner for latest ten minutes for the colour to leach out of the cabbage,filter out the plant material to obtain a red purple-bluish colour liquid  

Drill gauge

Products  drill gauges & Stands General's drill Gages are used to quickly and conveniently identify drill bit sizes. Made of heat treated heavy gage steel, machined and ground to close tolerances. Hole sizes and decimal equivalents are permanently etched on the face.

drill gauges. General's drill Gages are used to quickly and conveniently identify drill bit sizes. Made of heat treated heavy Gages steel, machined and ground to close tolerances. Hole sizes and decimal equivalents are permanently etched on the face.