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molar-solutions-solids

# molar-solutions-solids - Making Molar Solutions From Solids...

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Making Molar Solutions From Solids

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What are molar solutions? What are molar solutions? A molar solution is one that expresses “concentration” in moles per volume Usually the units are in mol/L mol/L can be abbreviated as M or [ ] Molar solutions are prepared using: a balance to weigh moles (as grams) a volumetric flask to measure litres L refers to entire volume, not water! Because the units are mol/L, we can use the equation M = n/L Alternatively, we can use the factor label method
Calculations with molar solutions Calculations with molar solutions Q: How many moles of NaCl are required to make 7.5 L of a 0.10 M solution? But in the lab we weigh grams not moles, so … Q: How many grams of NaCl are required to make 7.5 L of a 0.10 M solution? M=n/L, n = 0.10 M x 7.5 L = 0.75 mol # mol NaCl = 7.5 L x 0.10 mol NaCl 1 L = 0.75 mol # g NaCl = .5 L x 0.10 mol NaCl 1 L =43 .83 g x 58.44 g NaCl 1 mol NaCl Read pages 288 – 290. Do Q 19 - 22

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19. # g NaOH =
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molar-solutions-solids - Making Molar Solutions From Solids...

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