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- Three students titrate different samples of the same solution of HCI to obtain its molarity. Below are their data. Student A: 20.00mLHCl+20.00mLH2O 0.100 M NaOH used to titrate to the equivalence point Student B: 20.00mLHCl+40.00mLH2O 0.100 M NaOH used to titrate to the equivalence point Student C: 20.00mLHCl+20.00mLH2O 0.100 M Ba(OH)2 used to titrate to the equivalence point. All the students calculated the molarities correctly. Which (if any) of the following statements are true? (a) The molarity calculated by A is half that calculated by B. (b) The molarity calculated by A is equal to that calculated by C. (c) The molarity calculated by B is twice that calculated by C. (d) The molarity calculated by A is twice that calculated by B. (e) The molarity calculated by A is equal to that calculated by B.How many mL of 0.622 M HI are needed to dissolve 5.15 g of BaCO3? 2HI(aq) + BaCO3(s) · BaI₂(aq) + H₂O(l) + CO₂(g) mLHow many mL of 0.535 M HI are needed to dissolve 7.98 g of BaCO3? 2HI(aq) + BaCO3(s) →→→→→→ BaI₂(aq) + H₂O(1) + CO₂(g) mL
- False In a titration, a 9.9 ml solution of 0.25N HCI is neutralized with 53.7 ml of NaOH. What is the normality of the NAOH solution? 0.05 0.46 2126.52 212.65 How many moles are there in 493.13 g of Hexane (CH)? UG 4) a D IIWhat volume of 0, 955 M HCI (in mL0 is required to titrate 2,152 g of Na2CO3 to the equivalence point? Na2CO3 (aq) + 2HCI (aq) - H2O (l) +CO2 (g) + NaCI (aq)Q7. Karl Fisher titration is used to determine moisture content of food products according to the chemical reaction below: 2H₂O + SO₂ + 12 → H₂SO4 + 2HI (i) Name the reaction that involved. (ii) Identify the FOUR major chemical components needed in the Karl Fisher reagents. (iii) Rewrite the actual chemical reaction(s) that involved during Karl Fisher titration. (iv) Outline the function of each major chemicals in the reaction stated in answer (iii).
- 1. Why was it important to use "flat" soft drinks for your titrations? Would your calculations of the molarity of citric acid have been too high or low if you hadn't used a "flat" soft drink? 2. Grape juice contains diprotic acid, tartaric acid, which has the molecular formula C4H6O6. If 20.00 mL of grape juice required 36.00 mL of 0.0500 M NaOH for the titration to a pink endpoint, what is the molarity of tartaric acid on the grape juice? 3. Diet Big Red soda contains citric acid, as shown in the ingredient list below, Carbonated Water, Citric Acid, Natural and Artificial Flavors, Sucralose, Sodium Benzoate, Caffeine, Malic Acid, Red 40, Acesulfame Potassium, Phosphoric Acid, and Acacia Gum What are two obvious reasons that we did not try to determine the citric acid content in a "flat" sample of Diet Big Red soda?A certain indicator, HA, has a ?a value of 7.9×10^−7. The protonated form of the indicator is yellow and the ionized form is red. What is the p?a of the indicator? p?a= A generic salt, AB2, has a molar mass of 287g/mol and a solubility of 2.80 g/L at 25 °C. AB2(s)↽−−⇀A2+(aq)+2B−(aq) What is the ?sp of this salt at 25 °C? ?sp=The identity of an unknown monoprotic organic acid is determined by titration. A 0.703 g sample of the acid is titrated with 0.195 M NaOH. What is the molar mass of the compound if 20.0 mL of the NaOH solution is required to neutralize the sample? molar mass: g mol The compound is 60.0% C, 4.48% H, and 35.5% O. What is the molecular formula of the organic acid? formula:
- How many mL of 0.601 M HCI are needed to dissolve 8.54 g of MgCO? + MgCO3(s) → MgCl2(aq) + H2O + CO2(e) 0.203mL O 0.337mL O 337mL ) 84.27mLConsider the titration of HCI with KOH. Using the balanced equation: KOH + HCI --> KCI + H2O KOH = 1 mole HCI for balanced equation) (Assume 1 mole A 10.00 Liter (L) sample of HCI requires 35L of 0.100 M KOH. What is the molarity (M) of the acid? O 0.10 M HCI O 0.0010 M HCI O 0.35 M HCI O 0.70 M HCI O 0.0015 M HCI O 0.15 M HCI O 0.20 M HCI O 0.50 M HCI O 0.0050 M HCIMolarity of the standard solution of sodium hydroxide = 0.1010 mol/L Volumes of NaOH(aq): Second Third Rough titration First titration titration titration Final burette reading: (mL) Initial burette reading: (mL) Volume of NaOH(aq) Titrated (added) (mL) 18.48 33.58 48.40 23.72 3.48 18.48 33.60 8.73 Fourth Fifth titration titration Final burette reading: 38.68 20.62 (mL) Initial burette reading: (mL) Volume of NaOH(aq) Titrated (added) (mL) 23.80 5.75 2. What is phenolphthalein and why is it required in this experiment?
