A 0.4708-g sample of primary-standard-grade Na2 CO3 required 34.74 mL of an H2SO4 solution to reach the end point in the reaction 2- CO3 + 2H* → H2O + CO2 (g) What is the molar concentration of the H2SO4? Concentration= M

2. The reaction between lead(II) nitrate and potassium iodide solution is shown below   Pb(NO3)2(aq) + 2 KI(aq) → 2 KNO3(aq) + PbI2   Calculate the mass of lead(II) iodide precipitated when 5.00 cm3 of 4.00 mol dm–3 lead(II) nitrate solution  is mixed with 7.50 cm3 of 5.00 mol dm–3 potassium iodide solution.    [Mr / g mol–1: PbI2 = 461.01]

A 1.000-g sample of a sweetening agent containing soluble Saccharin (MM=205.17g/mol) was analyzed using the Volhard method as follows: Step 1: Sample was dissolved in distilled water and treated with 10.0 mL of 0.05M AgNO3. Saccharin-Na + Ag+ → Saccharin-Ag (s) + Na+ Step 2: The solid, Saccharin-Ag (s), formed was filtered off and washed with water. The filtrate and washing were collected quantitatively. Step 3: Titration of the filtrate and washings required 4.6 mL of 0.04M KSCN. KSCN + Ag + → AgSCN (s) + K+ Calculate weight % saccharin in the sweetening agent sample.   could you type it out, please

Part A) A 10.0 mL sample of 0.250 mol/L NiF2(aq) is mixed with 20.0 mL of 0.0900 mol/L NaOH(aq) and then diluted to a final volume of 100. mL.Calculate the concentration of Ni2+ ions in the 100 mL mixture before the reaction starts. Express your answer to three significant figures.ksp: 5.48e-16

13. Hydroxyapatite is the main mineral component of bone. How many grams of hydroxyapatite will dissolve in 1.00 L of H20? Ksp = 2.34 x 10-59; Molar mass = 502.3 g/mol Cas (PO4)30H (s) 5 Ca2+ (aq) + 3 PO43- (aq) + OH- (aq)

23. Silver (1) ions form a precipitate with chromate ions. Ksp = 9.0 x 10-¹2. a. Write the balanced chemical equation of the reaction. Indicate physical states of all reaction components. 4 Agcag) + Croucags + Ay₂ CrO4(s) t b. Calculate the solubility of the precipitate in pure water. C. Calculate the solubility of the precipitate in a solution containing 0.100 M potassium nitrate.

Suppose the Kc value for Cobalt (II) hexahydrate is 6.80 and suppose upon heating the solution turned pink.  If a group of student started mixed 10.5 mL of a 1.25 M [Co(H2O)6]2+(aq) solution with 12.5 mL of a 1.55 M solution of NaCl(aq) with 15.25 mL of a 1.39 M [CoCl4]-2(aq) solution then what color is the solution at equilibrium?   [Co(H2O)6]2+(aq)  +  4 Cl-(aq)      [CoCl4]-2(aq)  +  6 H2O(L)   Multiple choices   pink   purple   green   black   orange   brown   blue   colorless   yellow   gray   red   green