Question

i need help with these three questions

Incorrect Question 2 0/1.25 pts 0.678 g of KHP is used to standardize a NaOH solution. If it took 31.55 mL of NaOH to neutralize the KHP, what is the concentration of the NaOH solution? The molar mass of KHP is 204.22 g/mol. KHP + NaOH --> NaKP + H2O Give the answer to 3 sig figs and use units of M 0.0214 Unanswered Question 3 0/1.25 pts A 25.00 mL HCl sample is titrated with a 0.998 M NaOH solution. If it took 48.85 mL of the NaOH solution to titrate the acid sample, what is the concentration of the acid sample? HCI + NaOH --> NaCl + H2O Give the answer to 3 sig figs and use units of M

Answer 1

Question 2 mass of KHP = 0.6789 204.zaglmol Molar mass .. number of molesz mass motor roass number of moles = 0.6769 204.22 g/mol number of moles = 0.00332 --3 number of moles 3,32 x10 motes Given equation : Nakp + H₂O NaOH KHP+ from balanced equation, 1 note of KHP seads with 1 mote of NAOH -3 3,32xlo moles of KHP will react with 3.32x109 moles of NaOH. Number of notes of NaOH = 3.32xromotes Volurse = 31.55 m2 -3 In utres 31.55810L concentration No. of moles Volume in litres 3.32x10 moles 31.55 x103 L concentration = 0.105 M.

Question 3 : Given Reaction HCl + NaOH - NaCl + H2O consider formula: a, Mil= 92M₂ V2 9, = acidity of base = 1 Az = basicity of acid = 1 Mi a molarity of base 0.998m Ma= molarity of acid = ? Vi = volume of base = 48.85mL Ve = Volume of avid 225.00m2 Rearranging equation, Ma = Q, NU, V, - 1x0.998M X 48.85ml Og Væ 1x25-00ML Answer: Ma = 1095M Question 4 Answers : * To find out the exact concentration of it * Because NaOH attrado Water so its mass isn't accurate (because absoobs moisture from atmosphere)