GOB CHEM 120a CP1 Summer 2016 of a soluion of ntric acks, HNOs. She puts 745 mL
ID: 1008249 • Letter: G
Question
GOB CHEM 120a CP1 Summer 2016 of a soluion of ntric acks, HNOs. She puts 745 mL of the acid in a flask along wh a tew drops of indcator She then sthowy adds 0 800 M Ba(OH), to the task unti the solution turns pink, indicating the equivalence point of the ation She rotes that 135t Ba(OH)2 was needed to reach the equivalence port Solution map In an acid-base ttration, an acid (or base) of known concentration is added to a base (or acid) of unknownin this tration, the concentration or base s known and can be used to cakouliate t concentration unti the number of motes of H and OH are equal a c pont Since you know the number of moies orH (or OH ) that you added, you can determine the number of moles of OH (or H·jm the unknown solution the unknown acid concentration Part A How many moles of Ba(O11), are present n 135 mL ot o 8oo M Ba(OHl),? atoms, and t3 5.93 M Part BExplanation / Answer
Ans = 0.108 moles
Exp :
Molarity M = moles / Ltr of solution (1000 mL)
0.8 M = 0.8 moles / 1000 mL
Therefore in 135 mL = (0.8 moles/1000 mL)*135 mL = 0.108 moles
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