10.00 grams of KH2PO4 (FW = 136.086 g/mol) are dissolved in 500 mL of deionized H2O....
10.00 grams of KH2PO4 (FW = 136.086 g/mol) are dissolved in 500 mL of deionized H2O. How many grams Na2HPO4 (FW = 141.96 g/mol) need to be dissolved to create a solution with a pH of 6.90? For H3PO4, pKa1 = 2.15 , pKa2 = 7.20, and pKa3 = 12.37.
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![According to Handersons equation. ph= pk + log [Mat Pou] [kth Pou pH = 7.20 + log n/90.98 1468 6.9 .7. 20t log - . 1468X70.9](http://img.homeworklib.com/questions/dde0fdd0-d85e-11eb-b87b-bb58e73ad18a.png?x-oss-process=image/resize,w_560)
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10.00 grams of KH2PO4 (FW = 136.086 g/mol) are dissolved in 500
mL of deionized H2O....
Calculate the pH of the solution resulting from the addition of 50 mL of 0.10 mol/L...
Calculate the pH of the solution resulting from the addition of 50 mL of 0.10 mol/L H2SO4 solution to 50 mL of 0.20 mol/L Na3PO4 solution. Data: pKa1 (H3PO4) = 2.15; pKa2 (H3PO4) = 7.20; pKa3 (H3PO4) = 12.35
A 22.9 % (by mass) solution of ferrocene (FW = 186.04 g/mol) dissolved in hexane (FW...
A 22.9 % (by mass) solution of ferrocene (FW = 186.04 g/mol) dissolved in hexane (FW = 86.18 g/mol) has a density of 1.421 g/mL. What is the mole fraction (Χ) of ferrocene? Ferrocene is a non-electrolyte.
How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to...
How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 650.0 mL of a 0.0420 M succinic acid solution to produce a pH of 5.867? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).
How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to...
How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 520.0 mL of a 0.0404 M succinic acid solution to produce a pH of 5.903? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).
0.4556 g of Na2CO3 (FW = 105.99 g/mol) was dissolved in water and titrated with a...
0.4556 g of Na2CO3 (FW = 105.99 g/mol) was dissolved in water and titrated with a solution H2SO4 of unknown Normality. 20.35 mL of H2SO4 solution was required to reach the final endpoint. What is the Normality of the H2SO4 solution? (Answer in 4 sig figs)
The nonvolatile, nonelectrolyte sucrose , C12H22O11 (342.3 g/mol), is soluble in water H2O. How many grams...
The nonvolatile, nonelectrolyte sucrose , C12H22O11 (342.3 g/mol), is soluble in water H2O. How many grams of sucrose are needed to generate an osmotic pressure of 3.56 atm when dissolved in 227 ml of a water solution at 298 K. grams sucrose
A 1.225-g white solid mixture of [CaCl2 2H2O (147.02 g/mol) + K2C2O4 H2O (184.24 g/mol)] was dissolved in 150 mL of de...
A 1.225-g white solid mixture of [CaCl2
2H2O (147.02 g/mol) +
K2C2O4
H2O (184.24 g/mol)] was dissolved in 150 mL of deionized
water, heated and then cooled. The mass of the air-dried product
[CaC2O4
H2O (146.12 g/mol)] after filtration was 0.385g. A test
revealed the limiting reactant is
K2C2O4
H2O. Calculate the percentage of excess reactant
in salt mixture.
We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageWe were unable...
You are instructed to create 400. mL of a 0.40 M phosphate buffer with a pH...
You are instructed to create 400. mL of a 0.40 M
phosphate buffer with a pH of 6.4. You have phosphoric acid and the
sodium salts NaH2PO4,
Na2HPO4, and Na3PO4
available. (Enter all numerical answers to three significant
figures.)
H3PO4(s) +
H2O(l)
H3O+(aq) +
H2PO4−(aq)
Ka1 = 6.9 ✕ 10−3
H2PO4−(aq) +
H2O(l)
H3O+(aq) +
HPO42−(aq)
Ka2 = 6.2 ✕ 10−8
HPO42−(aq) +
H2O(l)
H3O+(aq) +
PO43−(aq)
Ka3 = 4.8 ✕ 10−13
Which of the available chemicals will you use...
a solution is prepared by mixing 2.50 g of acetic acid (CH3CO2H, FW=60g/mol, Ka=1.75x10^(-5) with 4.70...
a solution is prepared by mixing 2.50 g of acetic acid (CH3CO2H, FW=60g/mol, Ka=1.75x10^(-5) with 4.70 g of sodium acetate (CH3CO2Na, FW=82g/mol) and adding water to a 500 mL volume. Note that sodium acetate yields Na+ and CH3COO-, the conjugate base of acetic acid. a.) what is the pH? b.) 15mL of 0.50 M HCl were added to the 500 mL solution, what is the pH after addituon of acid? write answer to 3 sig. figured.
A student dissolves 0.2062 g of caffeine (MW: 194.19 g/mol) into 50.00 mL of deionized water....
A student dissolves 0.2062 g of caffeine (MW: 194.19 g/mol) into 50.00 mL of deionized water. What is the concentration of the caffeine in the solution in ppm (parts per million)? A student performs a spectrophotometric analysis using external calibration and obtains a linear relationship with a slope of 0.0550 and a y-intercept of 0.011. In order to analyze an unknown solution, the student dilutes 10.00 mL of the unknown solution to 50.00 mL. If the absorbance of the dilute...
A 1.225-g white solid mixture of [CaCl2
2H2O (147.02 g/mol) +
K2C2O4
H2O (184.24 g/mol)] was dissolved in 150 mL of deionized
water, heated and then cooled. The mass of the air-dried product
[CaC2O4
H2O (146.12 g/mol)] after filtration was 0.385g. A test
revealed the limiting reactant is
K2C2O4
H2O. Calculate the percentage of excess reactant
in salt mixture.
We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageWe were unable...
You are instructed to create 400. mL of a 0.40 M
phosphate buffer with a pH of 6.4. You have phosphoric acid and the
sodium salts NaH2PO4,
Na2HPO4, and Na3PO4
available. (Enter all numerical answers to three significant
figures.)
H3PO4(s) +
H2O(l)
H3O+(aq) +
H2PO4−(aq)
Ka1 = 6.9 ✕ 10−3
H2PO4−(aq) +
H2O(l)
H3O+(aq) +
HPO42−(aq)
Ka2 = 6.2 ✕ 10−8
HPO42−(aq) +
H2O(l)
H3O+(aq) +
PO43−(aq)
Ka3 = 4.8 ✕ 10−13
Which of the available chemicals will you use...
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