Question

please show work for both

3. It takes 38ml. of 0.75M sodium hydroxide solution to completely neutralize 155mL of a sulfuric acid solution. What is the concentration of the sulfuric acid solution? 4. What does it mean to standardize a solution? What are the steps to standardize a 0.2M HC1 solution?

Answer 1

# Ginen, 38 ML of 0'75 M NaOH solution completely neutralise iss mL of sulfuric acid. The neutralization reaction is, 2 NAOH + H2 504 = Naz 504 + 2 H20 - o Now, moles of NaOH = Molarity x vowme in withe : 0975 M X 38 L 1000 z 0'0285 moles of NaOH # Now, a moles of Naot requires Imole H2504 for neutralisation (from eamation (19) X00285 is 0'0285 moles Naot reamures moles H2SO4 2 0:01425 mole - H2SO4 Now, Ginen volume of H2504 155 mL = 1558103 1. moles i, concentration of M2 504 Molarity = 304, Moranny a Volume 0.01425 z 755X10-3 -3 M " = 0.092 M Scanned with c Arst CamScanner

Standardize a solution standardization of a solution is the process of calculating the exact concentration of a solution standard solution contains a known concentration which can be used to determine the unknown concentration of another subst- rance by using the formula, Memown Nknown = Munknown Nuuknown where. M y concentration of a substance - vo volume of a substance. for standardization of a solution, Titration is often used as an analytical procedure. steps to standardize a 002 M HCl solution . ci Standardization of Ou2 M Ha solution against 4) Pipeété out, 25 mL of Hucaql solution into a conical flask and add two drops of methys orange ... indicator in it. The solution turns Redi, as the presence of Acidic medium B He is titrated solution and the scolour it changes San SeaTTTTET with standard Na2CO3 end point mill occur when light yellow / orange. to

3 as the Naacom solution are in the surette, so nolume of Nazcoa used can be recorded from the burette value. ki Moly le co use We Tovula , MHU VHU = Nagcon Mna₂ CO 3 where, "Nagcon is calculated from the burette M Nagcom is known NHL = known is here it is as me unen we can calculate, M He as Mitu = M Na₂CO3X ENa2CO3 NHA # cs Scanned with CamScanner