5. (4 pts) Calculate at for a 0.0350 molal solution of Na PO, if + =...
Calculate the molar Y^4- concentration in a 0.0350 M EDTA solution buffered to pH of 11.00. At pH 11.00 alpha_4 is 0.85. 2.98 times 10^-2 7.23 times 10^-3 3. 10^-3 3.41 times 10^-8 4.27 times 10^-4
(5 pts.) A laboratory assistant is preparing 4 liters of a 0.5M solution of sodium phosphate (NasPO4). How many grams of Na POs the laboratory assistant need to add to achieve the desired molar concentration? (5 pts.) The laboratory assistant found the hydrated form, Na,Po412H.O, in the lab instead of NasPO4. Should he/she change the amount of Na,PO.12H20 added? If so, what is the amount of NasPOs.12H2O to be added? a) b)
(References A solution contains 4.4 x 10-5 M Na,PO. What is the minimum concentration of AgNO, that would cause precipitation of solid Ag, PO (K =1.8 x 10 Concentration - Su An Try Another Version memorie
A 50.00-mL solution of 0.0350 M trimethylamine (Kb = 6.5 × 10^–5) is titrated with a 0.0228 M solution of hydrochloric acid as the titrant. What is the pH at the equivalence point? (Kw = 1.0 × 10^–14) a) 9.81 b) 8.16 c) 3.02 d) 4.19 e) 5.84 Ans: e
calculate the mass of water necessary to make a 1.26 molal h2so4 solution from 24.4 g of h2so4
6. A 1.500 g sample of a mixture of solid Na PO, 12H.O mixed with NaCl, was dissolved in water, reacted with aqueous 1 M SrCl, and 0.520 g Sr.(PO), precipitate was collected and dried to a constant mass. If the reagent tests demonstrated that Na PO:12H.O was the limiting reactant in the precipitation reaction, calculate the mass percent of Na PO, 12H 0 in the original sample. a. How many moles of Sr,(PO), were produced? b. What is the...
Calculate the molal (not molar) concentration: c) A 1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water.
Titrate 40.0 mL of 0.0350 M benzoic acid (C6H5COOH, Ka = 6.3 × 10–5) with 0.0700 M NaOH Calculate the pH in the solution at equivalent point. a) 5.716 b) 8.284 c) 8.372 d) 5.628 e) 7.546
Calculate the boiling point in C) of a 4.68 m aqueous sucrose solution. The molal boiling point constant for water is 0.521 °C/m. Be sure to report your answer to the correct number of significant figures and use the correct unit,
6+ (20 pts.) You prepare a buffer by ading 0.I mol of Na,PO, and 0.15 mol of NaJHPO, to 1.0 L of water. (pKal-2.148, pk, 7.198, and pKas 12.375) a. What do you expect the pH to be? b. If instead you begin with 1.0 L of a 0.1 M solution of NaH2POs, how many ml of a 0.5 M KOH solution do you need to add in order to reach a pH of 9.5?