A weak acid is titrated with 0.1236 M NaOH. From the titration curve you determine that the equivalence point occurs at 12.42 mL of added NaOH. What volume of added NaOH corresponds to the half-equivalence point?


Answer 1


(Incomplete question)

Assuming the molarity of the weak acid is 17.4 M, the answer would be 52.4mL.


Equivalence point is defined as the point where moles of titrant = moles of titrand (analyte).

At equivalence point,

# moles of NaOH = # moles of weak acid

# moles of NaOH = 0.1236 (mol)/(L) × 12.43 mL

= 0.1236 mol/L × 0.01242 L

= 0.00153511 moles of NaOH

= 0.00153511 moles of weak acid.

Since the concentration of acid is not stated in your question, we will assume the concentration of the acid to be 17.4 M.

concentration = no. of moles ÷ volume

⇒ vol. = no. of moles ÷ conc.

= 0.00153511 mol ÷ 17.4 mol/L

= 0.0267 L ≈ 26.7 mL

This means that the total volume of the solution at the half equivalence point will be:

26.7 mL + 26.7 ml

= 52.4 mL.  

N.B: Confirm missing variable from question: it could be concentration or volume of acid,but it is impossible to have two unknowns. Also, incase its pH of acid that's given, you can solve problem using Henderson-Hasslebauch equation.

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Benadryl is used to treat itchy skin in dogs. The recommended dosage is 1 mg per pound. What mass of Benadryl, in milligrams, should be given to a dog that weighs 29.5 kg?



65 mg


We are given the dosage per pound but have the weight of the dog in kilograms, thus we should convert the 29.5 kg to punds ( 1 pound = 0.454 kg):

29.5 kg  x 1 lb / 0.454 kg = 64.7 lbs

So now can answer our question:

( 1 mg / lb ) x 64.7 lb = 64.7

rounding to 65 mg

Final answer:

To treat itchy skin in a dog that weighs 29.5 kg, the dog should be given 65 mg of Benadryl.


To calculate the mass of Benadryl to give to a dog that weighs 29.5 kg, we need to use the recommended dosage of 1 mg per pound. First, we convert the weight of the dog from kg to pounds by multiplying it by 2.2046. So, the weight of the dog is approximately 65 pounds. To find the mass of Benadryl, we multiply the weight of the dog in pounds by the recommended dosage. Therefore, the dog should be given 65 mg of Benadryl.

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6 CO2 + 6 H2O
How many atoms of each element are in
the equation?



There are 6 Carbon dioxides, and 6 waters, but there are 6 carbons, 18 oxygens, and 12 hydrogens.



6 carbon atoms

18 oxygen atoms

12 hydrogen atoms

Which expression correctly describes energy using SI units? A. 1 J=1kg•m^2/s^2 B. 1 J= 1kg•m/s^2 C. 1 J= 1kg• m/s D. 1 J= 1kg•m^2/s



A. 1 J=1kg•m^2/s^2


Energy refers to the capacity to do work. According to the International System of units (SI units), energy is measured in Joules.

Energy is represented by the force applied over a distance. Force is measured in Newton (N) and distance in metres (m). Hence, energy is Newton × metre (N.m)

Newton is derived from the SI units of mass (Kilograms), and acceleration (metres per seconds^2) i.e Kg.m/s^2, since Force = mass × acceleration.

Since; Energy = Newton × metres

If Newton = Kg.m/s^2 and metres = m

Energy (J) will therefore be; Kg.m/s^2 × m

1J = Kg.m^2/s^2

The theoretical yield for CuCO3.Cu(OH)2+2h2SO4 ®2CuSO4+2H2O+3CO2



bxnhdjxjdjvxjsj sbdhhxhchdbd

Does H form cation, anion both or neither ions?



hydrogen have electronic configuration of 1s¹ to acquire a stable state it can either lose electron and form H+cation or gain an electron( to compete its 1s subshell ) to form H- anion. As it has ±1 valency it is placed neither in group 1(alkaline metals ) nor in group 17 (halogens) .

What is the symbol of the element that is classified as an alkali metal and is in period 4?



Potassium (K) [First element in period 4]