Question

Your dad is refinishing his driveway. He poured hydrochloric acid on the concrete to etch it away. However, he poured too much and now wants to neutralize the acid, so the reaction will stop. You come to the rescue by putting drain cleaner, sodium hydroxide, on the acid. How many liters of drain cleaner (2.5 M) do you need to pour if you have a puddle of 500 mL puddle of 12 M HCl? a) 0.0096 L b) 480 L c) 2.4 L d) 4.8 L e) 2400 L

Answer 1

before dilution                                     after dilution

M1   = 12M                                        M2 = 2.5M

V1   = 500ml                                      V2=

M1V1 =    M2V2

V2    = M1V1/M2

= 12*500/2.5            = 2400ml   = 2.4L

c. 2.4L >>>>>answer