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

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The molarity definition is based upon the volume that the solution, not the volume that water.

Vocab. Lesson

Incorrect= The equipment is 5.0 Molarity.

Correct= The equipment is 5.0 Molar.

Example Problems

Level 1- given moles and liters

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

3.0 mol | = X = 1.5M solution |

2.0 liters |

Level 2- offered Molarity and liters that solution

Determine the number of moles of salt liquified in 5.0 liters the a 0.50M equipment of salt water.

X mol | = 0.5M solution |

5.0 liters |

cross multiply, X= 2.5 mols

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

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

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1st convert to moles, second plug right 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 milliliters of solution (instead the liters)

Determine the molarity when 55.5g that CaCl2 are dissolved to do 250.mL that solution.

1st transform to moles, 2nd convert come liters, 3rd plug right 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 connect to inspect the answers

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

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

Jan. 04-41 What is the molarity the a solution containing 20 grams of NaOH in 500 milliliters that solution?

(1) 1 M (2) 2 M (3) 0.04 M (4) 0.5 M

Jan 2002-42 What is the molarity of a systems that has 0.50 mole that NaOH in 0.50 liter that solution?(1) 1.0 M (3) 0.25 M(2) 2.0 M (4) 0.50 M

Aug. 2006-42 just how many complete moles the KNO3 need to be dissolved in water to do 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 do 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 identified as the(1) moles of solute per kilogram the solvent(2) mole of solute per liter the solution(3) fixed of a solution(4) volume that a solvent

Aug 2008-15 i m sorry phrase describes the molarity the a solution?(1) liters of solute every mole of solution(2) liters of solution per mole that solution(3) moles of solute every liter of solution(4) mole of systems per liter the solution

June 2009-46 which sample that HCl(aq)contains the greatest variety of moles of 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 complete of(1) 3.0 grams that HCl every liter of water(2) 3.0 grams that HCl every mole that solution(3) 3.0 moles of HCl every liter that solution(4) 3.0 mole of HCl per mole that water

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

Jan 2008-15 i m sorry unit have the right to 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 that a equipment containing 20 grams that 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 solution that includes 52 grams that lithium fluoride, LiF, (gram-formula massive =26 grams/mole)?(1) 1.3 M (3) 3.0 M(2) 2.0 M (4) 0.75 M