The concentration of the phosphoric acid solution required for the titration of 252 ml of 0.218 M potassium hydroxide solution is 0.2289 M.
To determine the concentration of the phosphoric acid solution, we can use the titration equation:
mole of acid = moles of base
Phosphoric acid (H3PO₄) reacts with potassium hydroxide (KOH) in a 1:3 ratio:
H₃PO₄ + 3KOH → 3H2O + K₃PO₄
Now, we can calculate the moles of KOH using its volume and concentration:
moles_KOH = volume_KOH × concentration_KOH
moles_KOH = 0.252 L × 0.218 M
moles_KOH = 0.054936 mol
Since H3PO4 reacts with 3 moles of KOH:
moles of H₃PO₄ = moles KOH / 3
moles of H₃PO₄ = 0.054936 mol / 3
moles of H₃PO₄ = 0.018312 mol
Now, we can determine the concentration of H3PO₄:
concentration of H₃PO₄ = moles_H3PO4 / volume_H₃PO₄
concentration of H₃PO₄ = 0.018312 mol / 0.080 L
concentration of H₃PO₄ = 0.2289 M
So, the concentration of the phosphoric acid solution is approximately 0.2289 M.
Learn more about the titration : brainly.com/question/186765
#SPJ11
report the answer to the
appropriate number of
significant figures.
1204.2 +4.79613 = [ ? ]
This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:
In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.
In the case of additions, we perform the normal operation as the first step:
1204.2 +4.79613 = 1208.99613
Next, we round the result to the leastnumber of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the onlydecimalplace:
1209.0
Learn more about significant figures: brainly.com/question/11904364
%yield = 86.93%
Given
Reaction
CaCN₂+3H₂O=>CaCO₃+2NH₃
Required
The percent yield
Solution
mol CaCN₂(MW= 92 g/mol) :
= mass : MW
= 77 g : 92 g/mol
= 0.834
From equation, mol NH₃ :
= 2/1 x mol CaCN₂
= 2/1 x 0.834
= 1.668
Mass NH₃(theoretical):
= 1.668 mol x 18 g/mol
= 30.024 g
% yield = (actual/theoretical) x 100%
%yield = (26.1/30.024) x 100%
%yield = 86.93%
B.) Positive two
C.) Negative one
D.) Negative two
The correct answer is C. An electron has a charge of -1 and a smaller mass than a proton. Proton has the same mass with the neutron. The ratio between the mass of a proton and an electron is about 2000. An electron has an equal value but negative charge with the proton.