Solution Conc - Diluting Concentration Solutions • Dilution the number of moles of solute remains the same only the vol is changed by adding more

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1 Concentrations of Reactants in Solution: Molarity •Most chemical reactions are carried out in a solution. Reactants must have considerable mobility for reaction to occur. •Solute - a substance dissolved in a solution. Concentrations of Reactants in Solution: Molarity • Concentration - describes the relative amount of solute to solvent or solution. • Molarity (M) - the number of moles of solute dissolved in each 1 liter of solution. Dissolve the solute in enough solvent to give 1 liter of solution. – Can be used as a conversion factor. Concentrations of Reactants in Solution: Molarity • What is the molarity of soln prepared by mixing 16.8 g NaOH and diluting to a final vol of 2.5 L? • How many g of K 2 Cr 2 O 7 are present in 250 mL of a 0.025 M soln of K 2 Cr 2 O 7 ?
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2 Concentrations of Reactants in Solution: Molarity • A particular reaction requires the use of 36.7 g of H 2 SO 4 . How many mL of a 5.00 M H 2 SO 4 soln are required to provide 36.7 g of H 2 SO 4 ? • How many g of Pb(NO 3 ) 2 are needed to prepare 250 mL of a 0.10 M solution?
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Unformatted text preview: Diluting Concentration Solutions • Dilution - the number of moles of solute remains the same; only the vol is changed by adding more solvent. • M 1 V 1 = M 2 V 2 • What would the final concentration be if 25.0 ml of 12.0 M HCl was diluted to a final vol of 500 mL? Solution Stoichiometry • The molarity of a soln as a conversion factor in stoich calc. • How many mL of 0.025 M barium chloride are needed to react with 50 ml of 0.015 M sodium phosphate? How many grams of barium phosphate will be produced? • What vol of 12.0 M HCl is needed to react with 8.75 g of Zn? If the density of hydrogen gas is 0.0899 g/L, what vol of H 2 will be produced? 3 Titration • Procedure for determining the concentration of a soln. • Carefully measured vol of one solution reacts with a second soln of known conc and vol. • What is the M of Ba(OH) 2 if 38.4 mL of 0.215 M HCl is required to neutralize 20.0 mL of the Ba(OH) 2 soln?...
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This note was uploaded on 11/16/2011 for the course CHM 1025 taught by Professor J during the Summer '09 term at Santa Fe College.

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Solution Conc - Diluting Concentration Solutions • Dilution the number of moles of solute remains the same only the vol is changed by adding more

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