Compare the solubility of lead carbonate in each of the following aqueous solutions: Clear All 0.10 M Pb(CH3C00)2 More soluble than in pure water. 0.10 M (NH4)2CO3 Similar solubility as in pure water. 0.10 Μ KΝΟS Less soluble than in pure water. 0.10 M ΝΗCH, COO

Which of the following combinations would be the best choice to buffer the pH of a solution at approximately 7? Ionization Constants for Aqueous Weak Acids at 25 °C Acid K. (pK,) Conjugate Base Hydrogen phthalate ion, Cg H4(CO2H)(CO2) Acetic acid, CH3 CO,H Acetate ion, CH; CO2- 1.8 x 10-5 (4.74) Weak Acid Phthalic acid, C6 H4 (CO,H)2 1.3 x 10-3 (2.89) Dihydrogen phosphate Hydrogen phosphate ion, H2 PO4 Hydrogen phosphate ion, HPO42 6.2 x 10-8 (7.21) ion, HPO,2- Phosphate ion, PO,* 3.6 x 10-13 (12.44) O Na, HPO4 and NagPO4 O NaH2 PO4 and NazHPO4 O H;PO4 and NaH2 PO4

Highlight your values of A,B,C and D.  For your question: A mL of B mol/L sodium phosphate solution is combined with C mL of  D mol/L calcium bicarbonate.  (Calcium bicarbonate is soluble.) A       mL B      mol/L C       mL D      mol/L 75.0 ml 0.300 67.5 0.350   Before you begin your reaction, you must accurately produce 1.500 L of your sodium phosphate solution from sodium phosphate trihydrate solid.  Write out a procedure to explain all the steps you will take in the lab when making the solution to ensure that your solution concentration is accurate.  Please include calculations that show the required mass of solid.  Also include the correct names of all equipment used.

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0.03 The uv spectrum of a protein solution shows A280 nm = 0.43 and A260 nm = What is the approximate protein concentration in mg/mL?

Calculate the pH of a solution if  [H3O+] = 3.4 x 10-2M Indicate whether the solution is acidic, basic, or neutral

(b) Explain each of the following in terms of the properties of water. You are not limited to the three properties discussed in part (a): • the role of water as a medium for the metabolic processes of cells • the ability of water to moderate temperature within living organisms and in organisms' environment • the movement of water from the roots to the leaves of plants B IU 0/1

A 20.00 mL solution of 15.2 ppm CaCl2 (aq) is diluted to a final volume of 50.00 mL. What is the molarity of Cl- (aq) in the diluted solution?

80mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pl. The solution is then titrated with 0.2M HCI to a final pH of 2.1. Sketch the titration curve, labelling the pH and volume axes. Indicate the volume of HCl needed to reach each relevant pKa value and equivalence point(s). Relevant pka values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.

Assuming ideal behavior, rank the solutions boiling points, 1 is lowest to 4 highest boiling point: 0.1 m CaCl2 0.1 m NaOH [Choose ] [Choose ] 0.025 m Al2(SO4)3 [Choose] 0.25 m C6H12O6 [Choose ]