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Solute-the substance being dissolved Solvent-the substance doing the dissolving (the larger amount) Solution- a homogeneous mixture of the solute and the solvent Solution= solvent + solute Aqueous (aq)= water solution Tincture= alcohol solution Amalgam= Mercury solution Molarity (M)- is the molar concentration of a solution measured in moles of solute per liter of solution.  The molarity definition is based on the volume of the solution, NOT the volume of water. Vocab. Lesson Incorrect= The solution is 5.0 Molarity. Correct= The solution is 5.0 Molar. Example Problems Level 1- Given moles and liters Determine the molarity when 3.0 moles of sucrose are dissolved to make 2.0 liters of solution.
Level 2- Given Molarity and liters of solution Determine the number of moles of salt dissolved in 5.0 liters of a 0.50M solution of salt water.
cross multiply, X= 2.5 mols Level 3- Given grams (instead of moles) and liters of solution Determine the molarity when 117g of NaCl are dissolved to make 0.500 liters of solution. 1st convert to moles, 2nd plug into the molarity equation 117g NaCl( 1mol/58.5g)= 2.00mol NaCl
Level 4-Given grams (instead of moles) and milliliters of solution (instead of liters) Determine the molarity when 55.5g of CaCl2 are dissolved to make 250.mL of solution. 1st convert to moles, 2nd convert to liters, 3rd plug into the molarity equation 55.5g CaCl2( 1mol/111g)= 0.500mol CaCl2 250.ml( 1L/1000mL) =0.250L
Past Regents Questions-Follow link to check the answers Jan 2003-44 What is the molarity of a solution of NaOH if 2 liters of the solution contains 4 moles of NaOH?
Jan. 04-41 What is the molarity of a solution containing 20 grams of NaOH in 500 milliliters of solution? (1) 1 M (2) 2 M (3) 0.04 M (4) 0.5 M Jan 2002-42 What is the molarity of a solution that contains 0.50 mole of NaOH in 0.50 liter of solution?
Aug. 2006-42 How many total moles of KNO3 must be dissolved in water to make 1.5 liters of a 2.0 M solution? (1) 0.50 mol (2) 2.0 mol (3) 3.0 mol (4) 1.3 mol Aug 2005- 41 What is the total number of moles of NaCl(s) needed to make 3.0 liters of a 2.0 M NaCl solution?(1) 1.0 mol (3) 6.0 mol (2) 0.70 mol (4) 8.0 mol June 2006- 16 Molarity is defined as the(1) moles of solute per kilogram of solvent(2) moles of solute per liter of solution(3) mass of a solution (4) volume of a solvent Aug 2008- 15 Which phrase describes the molarity of a solution?(1) liters of solute per mole of solution(2) liters of solution per mole of solution(3) moles of solute per liter of solution (4) moles of solution per liter of solution June 2009-46 Which sample of HCl(aq) contains the greatest number of moles of solute particles? June 2007- 13 A 3.0 M HCl(aq) solution contains a total of(1) 3.0 grams of HCl per liter of water(2) 3.0 grams of HCl per mole of solution(3) 3.0 moles of HCl per liter of solution (4) 3.0 moles of HCl per mole of water June 2010-14 The molarity of an aqueous solution of NaCl is defined as the(1) grams of NaCl per liter of water(2) grams of NaCl per liter of solution(3) moles of NaCl per liter of water (4) moles of NaCl per liter of solution Jan 2008- 15 Which unit can be used to express solution concentration?(1) J/mol (3) mol/L (2) L/mol (4) mol/s Jan 04-41 What is the Molarity of a solution containing 20 grams of NaOH in 500 milliliters of solution?(1) 1 M (3) 0.04 M (2) 2 M (4) 0.5 M Jan 2010-40 What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass =26 grams/mole)?(1) 1.3 M (3) 3.0 M (2) 2.0 M (4) 0.75 M on to ppm or Molality back to Math of Chemistry Links
5 mol L−1. What is the molarity of a solution containing 20 grams of NaOH in 500 ml of solution?Number of moles of NaOH = 20gm40gm/mol = 0.5 moles. Therefore, 20 gm NaOH dissolved in 500 ml of solution has 1M of molarity. What is the molarity of a solution containing 8 g of NaOH in 500 ml of solution? Answer : The molarity of a solution is 0.4 mole/L. => Molarity = 0.2 M. What is the molarity of a solution of NaOH?The molarity of NaOH is 2.002 x 10 -2 moles x 1000 mL/L / 25.0 mL = 0.801 Molar. What is the molarity of a 450 mL solution containing 5g of NaOH? Answer Expert Verified =0.277777777778=0.28(approx.) How many grams of NaOH are there in 500 mL of a 0.250 M NaOH solution?Therefore, mass of NaOH in 500 mL of 0.225 M NaOH solution is 4.5 g. What is the strength of solution in molarity where 4 gram of NaOH is dissolved in 500 mL of solution?Calculate the molarity of the solution. Molarity of solution (M)=Moles of NaOHVolume of solution in litres=0.1 mol0.5L=0.2mol L-1=0.2M. What is the molarity of a solution containing 5 g of NaOH in 50 mL solution? The molarity of the solution =0.500 L0.125 moles=0. 25 M. What is the molarity of a solution of sodium hydroxide NaOH if 4.0 grams of NaOH is dissolved in 100 mL of water?So, the molarity of the solution will be 1M . What is the molarity of 10% NaOH solution in water?i.e 10/40 = 1/4 i.e 0.25M. What is the molarity of 5% NaOH? What is molar concentration of 5% solution of sodium hydroxide? However, wee need two additional informations: molar mass and density of the solution. Molar mass of NaOH is 40.00, in density tables you can find value of 5% NaOH solution density – 1.0554 g/mL. 10×5×1.0554/40.00=1.32 M. What is the molarity of a 5 NaOH solution?The molarity of a 5.00 % w/v NaOH is 1.25 M. How many grams of NaOH are in 500 ml of a 1 M solution?20 grams How can you prepare 500mL 0.01 m NaOH solution? “What mass of solid NaOH is needed to make 500mL of 0.1M NaOH solution?” To make one mole NaOH solution, dissolve 40 grams NaOH in 500mL of H2O. Related |
What is the molarity of a solution containing of NaOH in 500 ml of solution?
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