Molarity (M)- is the molar concentration that a solution measured in mole of solute every liter that solution.

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The molarity an interpretation is based on the volume the the solution, no the volume that water.

Vocab. Lesson

Incorrect= The equipment is 5.0 Molarity.

Correct= The equipment is 5.0 Molar.

Example Problems

Level 1- provided moles and liters

Determine the molarity as soon as 3.0 mole of sucrose are liquified to do 2.0 liters that solution.

3.0 mol | = X = 1.5M solution |

2.0 liters |

Level 2- offered Molarity and liters the solution

Determine the number of moles the salt dissolved in 5.0 liters of a 0.50M systems of salt water.

X mol | = 0.5M solution |

5.0 liters |

cross multiply, X= 2.5 mols

Level 3- offered grams (instead of moles) and liters of solution

Determine the molarity as soon as 117g the NaCl are dissolved to do 0.500 liters of solution.

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first convert come moles, second plug into the molarity equation

117g NaCl( 1mol/58.5g)= 2.00mol NaCl

2.00 mol | = 4.00M solution |

0.500 liters |

Level 4-Given grams (instead that moles) and also milliliters of solution (instead of liters)

Determine the molarity as soon as 55.5g that CaCl2 are dissolved to do 250.mL of solution.

1st convert to moles, second convert come liters, third plug into the molarity equation

55.5g CaCl2( 1mol/111g)= 0.500mol CaCl2

250.ml( 1L/1000mL) =0.250L

0.500 mol | = 2.00M solution |

0.250 liters |

Past Regents Questions-Follow link to inspect the answers

Jan 2003-44 What is the molarity that a equipment of NaOH if 2 liters that the solution contains 4 mole of NaOH?

(1) 0.5 M (3) 8 M(2) 2 M (4) 80 M

Jan. 04-41 What is the molarity of a systems containing 20 grams that 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 that a systems that includes 0.50 mole that NaOH in 0.50 liter of solution?(1) 1.0 M (3) 0.25 M(2) 2.0 M (4) 0.50 M

Aug. 2006-42 exactly how many full moles of KNO3 must be liquified in water to make 1.5 liters the 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 the NaCl(s)needed to make 3.0 liters the 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) mole of solute every kilogram the solvent(2) mole of solute per liter that solution(3) fixed of a solution(4) volume the a solvent

Aug 2008-15 i beg your pardon phrase describes the molarity the a solution?(1) liters that solute per mole the solution(2) liters of equipment per mole the solution(3) mole of solute per liter of solution(4) moles of solution per liter the solution

June 2009-46 i m sorry sample that HCl(aq)contains the greatest number of moles that solute particles?(1) 1.0 l of 2.0 M HCl(aq)(2) 2.0 l of 2.0 M HCl(aq)(3) 3.0 together of 0.50 M HCl(aq)(4) 4.0 l of 0.50 M HCl(aq)

June 2007-13 A 3.0 M HCl(aq)solution consists of a total of(1) 3.0 grams of HCl every liter of water(2) 3.0 grams that HCl per mole the solution(3) 3.0 moles of HCl every liter that solution(4) 3.0 moles of HCl every mole that water

June 2010-14 The molarity of an aqueous solution of NaCl is defined as the(1) grams the NaCl per liter the water(2) grams of NaCl per liter that solution(3) moles of NaCl every liter the water(4) mole of NaCl per liter the solution

Jan 2008-15 which unit deserve to be used to express systems concentration?(1) J/mol (3) mol/L(2) L/mol (4) mol/s

Jan 04-41 What is the Molarity the a solution containing 20 grams the NaOH in 500 milliliters the solution?(1) 1 M (3) 0.04 M(2) 2 M (4) 0.5 M

Jan 2010-40 What is the molarity the 1.5 liters of an aqueous systems that includes 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