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- A 44.6 mL of 0.103 M HCI is added to an antacid sample. The solution is titrated to a bromophenol blue endpoint using 19.8 mL of 0.0998M NaOH. How many moles and how many grams of the base are in the antacid sample? Assume the active ingredient is MgCO3. Moles of NaOH? Moles of HCl? Moles of MgCO3? Mass of MgCO3?2KMnO4 (aq) +5H2C2O4 (aq) + 3H2SO4 (aq) > 10CO2 (g) + K2SO4 (aq) +2MnSO4 (aq) + 8H2O (l) 90ml of 0.0150 M KMnO4 solution is mixed with 30 ml of 0.095 M H2C2O4 solution in a medium where there is excess sulfuric acid. Assume 100% yield Calculate the concentration of the following ions or molecules in the final solution a) Mn2+ b) K+ c) MnO4- d)H2C2O4What is the mass of aectylsaliyclic acid (HC9H7O4, MW = 180.154 g/mol) from an aspirin tablets by titrating with NaOH. One tablet is dissolved in 25 mL of 50% ethanol solution. The resulting solution needed 13.41 mL of 0.2069 standardized NaOH titrant in order to achieve the phenolphthalein endpoint. What is the mg of aectylsaliyclic acid in the asiprin tablet?
- How many mL of 0.112M Pb(NO3)2 are needed to completely react with 25.0mL of 0.105M KI? Given: Pb(NO3)2 + 2KI -> PbI2 + 2KNO3.a. 11.7b. 23.4c. 0.147d. 5.85Im having trouble with this problem for adding Sodium Carbonate to neutralize 2.01x10^3 kg of sulfuric acid soln. it is given that sulfuric acid soln. Is 95% and 1.84g/mLIf 25 mL of 0.05 N NaOH required 30 mL of sulfuric acidfor titration. What is the normality of the acid?
- 0.4723-g sample of primary-standard-grade Na2CO3 required 34.78 mL of an H2SO4 solution to reach the end point in the reaction below. What is the molar concentration of the H2SO4?In one experiment, an 80.0-mL sample of hydrocyanic cid (HCN) was titrated with 20.0 mL of triiodide (I3-) in the reaction: HCN (aq) + I3- (aq) --> ICN (aq) + 2 I- (aq) + H+ (aq) 40.0 mL of the same triiodide solution were required to titrate 0.200 mol of H3AsO3 (aq) in the reaction: H3AsO3 (aq) + I3- (aq) + H2O (l) --> H3AsO4 (aq) + 3 I- (aq) + 2H+ (aq) What is the molar concentration of HCN (aq)? (Answer in sig figs)WHAT IS THE SIGNIFICANCE OF THE RATION OF STRENGTHS OF ACIDS AND BASES? what is the purpose of drying the primary standard before usage?
- In the second titration, the molar mass of an unknown monoprotic acid is calculated. If 0.100 grams of unknown solid are dissolved in water and titrated with 4.68 mL of the NaOH, what is the molar mass of the solid? HINTS: Molar mass is grams / moles. We have grams from the weighed mass, we can calculate moles of acid from the titration. Monoprotic means that it produces 1 H+ per molecule. This means that our moles of NaOH added and moles of acid are the same. You will need to use your concentration of NaOH from the previous questionThe concentration of an aqueous solution of CaSO4 (Ksp = 7.1 × 10–5) is 8.43 × 10–3 M. Qsp = ___ and this solution is ___.The reaction of KOH with HNO2 is presented by the unbalanced chemical reaction below: ___ KOH(aq)+ ___ HNO3 (aq)---> ___ KNO3 (aq)+ ___ H2O(l)Calculate the molar concentration of Nitric acid (HNO2) when 40.5 mL of 0.674 M KOH is required to quench 101.0 mL of Nitric acid over phenolphthalein indicator.