Topic B1 - Moles, formulae & equations
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What 3 things can a titration be used for?
-finding the conc. of a solution -identifying an unknown chemical -finding the purity of a substance
What is a standard solution?
a solution of a known concentration
What apparatus do you use to make a standard solution?
volumetric flask
How to prepare a standard solution (5 steps)
• weigh solid accurately • dissolve solid in beaker using distilled water • pour solution into volumetric flask and rinse traces into flask, using distilled water • fill flask to GRADUATION line, by adding distilled water one drop at a time, until bottom of meniscus lines up with mark (view at eye level) • slowly invert volumetric flask several times to mix solution thoroughly
A burette reading is recorded to the nearest…
0.05cm3 (reading has 2 decimal places, with last place either a 0 or 5)
What are concordant results?
within 0.10cm3 of each other
What is the end point of a titration?
when the indicator changes colour