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- Was wondering how to solve this hw problem? Calcium Flouride (dissociation) K@25 C = 3.94 *10^-11 Calcium fluoride is not very soluble in water. ** Its dissociation is: CaF2 (s) Ca²+ (aq) + 2 F¯ (aq) a. At 25°C, how many milligrams of CaF2 would dissolve in 2.0 L of water? b. What were your initial and final values of Q?ANSWER THE FOLLOWING WITH A COMPLETE SOLUTION. Compute for the pKa of benzoic acid (Ka = 6.3 × 10-5). What is the Kb of ammonia if its pKb is 4.75? What is the [OH-] of a solution if its pH is 5.69? Identify the [H+] of a solution with a pOH of 11.41. Identify if it is neutral, acidic or basic. What is the pH of a buffer prepared with 0.51 M disodium phosphate and 1.1 M sodium acid phosphate? (pKa of sodium acid phosphate = 7.21) Compute the pH of a buffer containing 0.62 M boric acid (Ka = 5.90 × 10-10) and 0.45 M sodium borate.Please answer 4 and 5 4. Determine the molar solubility of the M2+ and F- 5. Determine the Ksp value of MF2
- Phenolphthalein is a commonly used indicator that is colorless in the acidic form (pH 8.3) and pink in the base form (pH 10.0). It is a weak acid with a pKa of 8.7. What fraction is in the acid form when the acid color is apparent? What fraction is in the base form when the base color is apparent?Solve correctly please. A 100 mL solution is prepared by weighing 1.50 g from the mixture of KI and KBr. When the 20 mL part taken from this solution is titrated with 0.02 M AgNO3 solution, 105 mL is consumed. Accordingly, calculate the percentage of Kl in the mixture. (KI: 166 KBr: 119 g/mol) A. 56.3 B. 59 C. 41 D. 43.7 (Gpt/ai wrong answer not allowed)Give only typing answer with explanation and conclusion How many mg of NaCl is needed to make 15 mL of a 1% solution of naphazoline HCl isotonic with tears? (naphazoline HCl ΔTf1%=0.16°C) Report numerical answer rounded to a whole number.
- Rank the salts given in the table below from least soluble to most soluble in water. Salt # Name Ksp A Ag3PO4 2x10-18 B SrF2 8x10-10 C PbCl2 2x10-5 D BaSO4 2x10-9 E CoS 5x10-22The solubility of BaCO3BaCO3 is 22mg/L at 18 °C. What is its Ksp? At a certain temperature, the pKb value of NH4OH is 4.70. What is the [OH-] value of a 0.20 M solution of NH4OH at that temperature? (Kb for NH4OH is 2x10-5 .)A stock solution of approximately 7.7x10^-5 molar will be provided in lab. Determine the volumes of each solution needed to prepare 50.00 mL of standard solutions of concentration 0.600x10^-5molar, 1.20x10^-5molar, 2.40x10^-5molar, and 3.00x10^-5molar. Round the calculated volumes to thenearest 0.1mL.
- took 24.37 mL of 0.1224 M NaOH to reach the endpoint when titrating a sample containing 0.1650 g of an unknown acid. How many moles of sodium hydroxide were used?A 349 ml buffer soltution is 0.372 M in nitruous acid (HNO2) and 0.346 M in sodium nitrate (NaNO2). it's Ka is 5.6x10-4 and has a ph of 3.22. What is the ph after adding 187 ml of 0.100 M KOH to the intial buffer solution? Express answer using two decimal placesWhat is the concentration of 125 mL H2SO4 is needed to reach the equivalence point with 50. mL of 0.515 M KOH solution? Balanced equation: H2SO4 + 2 KOH → 2 HOH + K2SO4 write answer in correct number of sig figs