1.) Acetic acid is a weak monoprotic acid with Ka=1.8*10^-5. In an acid base titration, 100 mL of 0.100M acetic acid is titrated with 0.100M NaOH. What is the pH of the solution:

a.)Before any NaOH is added

b.)Before addition of 15.0mL of 0.100M NaOH

c.)At the half-equivalence point

d.)After addition of total of 65.0mL of 0.100M NaOH

e.)At equivalence point

f.)After addition of a total of 125.0mL of 0.100M NaOH

The half-equivalence point and the equivalence point should not be noted when measuring pH changes during a titration. True or False ?

How many grams of each of the following per 1000g of water in your car radiator are needed to give equal protection against freezing down to -10.0°C? (a) Methyl alcohol (CH3OH) b.p is 65°C, (b) ethyl alcohol (C2H5OH) b.p is 78°C, (c) ethylene glycol (C2H4(OH)2) b.p is 197°C. In spite of higher cost, what advantages does ethylene glycol have over the other alcohols as an all-winter antifreeze?

Which one of the following will act as a buffer solution?

• A.

  25 ml of 0.1 M NH₄Cl solution mixed with 12.5 mL of 0.1 M NaCl solution

• B.

  25 mL of 0.1 M NH₄Cl solution mixed with 25 mL of 0.1 M NaOH solution

• C.

  25 mL of 0.1 M HCl solution mixed with 12.5 mL of 0.1 M NaCl solution

• D.

  12.5 mL of 0.1 M acetic acid solution mixed with 25 mL of 0.1 M NaOH solution

• E.

  25 mL of 0.1 M acetic acid solution mixed with 12.5 mL of 0.1 M NaOH solution

clear solution would be greatly appreciated :)!

will rate, thank you!

The Winkler method for dissolved oxygen in water is based on the rapid oxidation of solid Mn(OH)₂ to Mn(OH)₃ in alkaline medium. When acidified, the Mn (III) readily releases iodine from iodide. A 240.-mL water sample, in a stoppered vessel, was treated with 1.10 mL of a concentrated solution of NaI and NaOH and 1.10 mL of a manganese(II) solution. Oxidation of the Mn(OH)₂ was complete in about 1 min. The precipitates were then dissolved by addition of 2.20 mL of concentrated H₂SO₄, whereupon an amount of iodine equivalent to the Mn(OH)₃ (and hence to the dissolved O₂) was liberated. A 24.5-mL aliquot (of the 244 mL) was titrated with 14.2 mL of 0.00861 M thiosulfate. Calculate the mass in milligrams of O₂ per milliliter sample. Assume that the concentrated reagents are O₂ free and take their dilutions of the sample into account.

14a. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.
How many grams of KHP are needed to exactly neutralize 22.3 mL of a 0.504 M calcium hydroxide solution ?
_______grams KHC₈H₄O₄

_14b. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.
What volume of a 0.561 M barium hydroxide solution is needed to exactly neutralize 5.17 grams of KHP ?
_____mL barium hydroxide

14c. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.
If 2.62 grams of KHP are needed to exactly neutralize 25.9 mL of a potassium hydroxide solution, what is the concentration of the base solution ?
_______M potassium hydroxide

A sheet of gold weighing 12.0 g and at a temperature of 20.0°C is placed flat on a sheet of iron weighing 21.5 g and at a temperature of 59.4°C. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings.

A 34.51−g stainless steel ball bearing at 104.89 °C is placed in a constant-pressure calorimeter containing 116.9 g of water at 22.47°C. If the specific heat of the ball bearing is 0.474 J / (g ·°C)calculate the final temperature of both the water and steel when they equilibrate. Assume the calorimeter to have negligible heat capacity.

A quantity of 2.00 ×10² mL of 0.641 M HCl is mixed with 2.00 ×10² mL of 0.321 M Ba(OH)₂ in a constant-pressure calorimeter of negligible heat capacity. The initial temperature of the HCl and Ba(OH)₂ solutions is the same at 21.87°C. For the process below, the heat of neutralization is −56.2 kJ/mol. What is the final temperature of the mixed solutions?

H⁺(aq) + OH⁻(aq) → H₂O(l)

A) Calculate the mass defect of the helium nucleus 52He. The mass of neutral 52He is given by MHe=5.012225amu. Answer in amu

B) Calculate the binding energy E of the helium nucleus 52He (1eV=1.602×10−19J). Answer in Mev

C) Calculate the binding energy per nucleon of the helium nucleus 52He. Answer in MeV

Hydrazine, N 2 H 4 , reacts with oxygen to form nitrogen gas and water. N 2 H 4 ( aq ) + O 2 ( g ) ⟶ N 2 ( g ) + 2 H 2 O ( l ) If 2.45 g of N 2 H 4 reacts with excess oxygen and produces 0.650 L of N 2 , at 295 K and 1.00 atm, what is the percent yield of the reaction?

Although the formula of this new chemical is a trade secret, it can be revealed that the formula for Herbigon is X-acetate (XCH3COO, where "X" represents the top-secret cation of the salt). It is this cation that kills weeds. Since it is critical to have Herbigon dissolved (it won't kill weeds as a suspension), you are working on adjusting the pH so Herbigon will be soluble at the concentration needed to kill weeds. What pH must the solution have to yield a solution in which the concentration of X+ is 3.50×10⁻³M ? The pKa of acetic acid is 4.76.

what is the molar concentration of 2-methylbutanol in its neat solution?

1) Determine the volume (liters) of 0.500 M NaOH solution required to neutralize 1.75 L of 0.250 M H2SO4. The neutralization reaction is: H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) + 2 H2O (l) Determine the volume (liters) of 0.500 M NaOH solution required to neutralize 1.75 L of 0.250 M H2SO4. The neutralization reaction is: H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) + 2 H2O (l) 7.00 0.875 1.75 0.438 none of the above

2) How many moles of HNO3 are present if 7.80×10−2 mol of Ba(OH)2 was needed to neutralize the acid solution? Express your answer with the appropriate units.

3)What is the final volume in milliliters when 0.919 L of a 41.5 % (m/v) solution is diluted to 21.8 % (m/v)?

please help with these problems and please show me how you got the answer

A 1.20-L contains 1.10 g of an unknown gas at STP . what is the molecular weight of the unknown gas?

Which of the following will increase the amount of product present at equilibrium for the reaction: 2A(g) B(g) AH 84 and K 1.3 x 103. (Chhose all correct answers) A) decrease the temperature B) decrease the volume of the reactino vessel C) Increase the temperature D) add a catalyst E) Increase the pressure by adding argon F) increase the pressure of A G) increase the volume of the reaction vesse