3) A solution of Ba(OH)2 was standardized against 0.1175g of benzoic acid. An endpoint was observed at 40.62 mL. What is the molarity of the base?
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- 3.) In the assay of NaHCO3, 3.0g of the solid is dissolved in 25mL water. What is the normality? How many mL of 1N H2SO4 will be required to neutralize this solution? From this volume of acid, compute the percent purity of NaHCO3.A road tanker carrying an acid was involved in an accident and its contents spilledon the road, iron drain covers began melting and fizzing as the acid ran over them. ASpecialist was called to se if the acid actually leaked into the nearby river.(a) Explain how the specialist could carry out a simple test to see if the river water contains some acid or not.(b) The word melting is incorrectly used in the report. Suggest a better name that should have been used.(c) Explain why drain covers began fizzing as the acid rain over them.If 25 mL of 0.05 N NaOH required 30 mL of sulfuric acidfor titration. What is the normality of the acid?
- What is the percentage of total acid expressed as acetic acid (CH3COOH) in a sample of vinegar if 3.000 g of the vinegar requires 20.50 mL of 0.1150 N KOH solution for an endpoint with phenolphthalein indicator? (Note: Use the least significant digits in your answer.)Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.)(a) 60 mL of 0.100 M HCl and 10.0 mL of 0.570 M HClH+ Cl - (b) 15.0 mL of 0.341 M Na2SO4 and 17.8 mL of 0.200 M KClNa+ K+ SO42- Cl - (c) 3.50 g of NaCl in 45.8 mL of 0.252 M CaCl2 solutionNa+ Ca2+ Cl -Determine the molar concentration of each ion present in the solutions that result from each of the following mixtures:(Disregard the concentration of H+ and OH- from water and assume that volumes are additive.) (a) 54.6 mL of 0.47 M NaCl and 77.6 mL of 1.16 M NaCl (b) 128 mL of 0.64 M HCl and 128 mL of 0.18 M HCl (c) 32.8 mL of 0.400 M Ba(NO3)2 and 24.8 mL of 0.258 M AgNO3 (d) 10.8 mL of 0.649 M NaCl and 21.7 mL of 0.177 M Ca(C2H3O2)2
- Info on phosphoric acid is: pKa1= 2.16 pKa2= 7.21 pKa3=12.32In no morethan 1000 words. Propose a procedure in preparing a 500 mL 1 M sodium hydroxide solution using the following materials, reagents, glass wares, and instruments. (Show necessary calculations): Materials/Glass wares:• 500 mL beaker• 500 mL volumetric flask• Weigh boat Reagents:• Distilled water• 300 g NaOH pellets Instruments:• Analytical balance.10ml of a solution of HCl required 12.5 ml of .4M Ba(OH)2 for complete neutralizaiton. how many moles of HCl were present in the sample
- Prepare 50 mL of the following acid solutions by using the given 38% concentrated HCl and 98% concentrated H2SO4 solutions, respectively. (HCl = 1180 g/L; H2SO4 = 1840 g/L) (a) 10 N HCl (b) 5 N H2SO4How many mL of a 0.157M solution of KOH is required to react with 0.385g of CH3COOH according to following equation: KOH + CH3COOH ---> KCH3COO + H₂O Answer should be written in decimal form to one decimal place, NO units in answer.I850 أسئلة امتحان الكيمياء العملي If you want to prepare a Sodium Hydroxide solution (40g/mole) (0.3M) in (250 mL) volumetric flask, * you will take. from (NaOH) 0.5g 3g 5g 3mg O