Answer:
The correct answer is 0.277 M HCl
Explanation:
NaOH is a strong base and HCl is a strong acid. NaOH reacts with HCl to form a salt (NaCl) and water via a neutralization reaction, as follows:
NaOH + HCl → NaCl + H₂O
At the equivalence point, the moles of NaOH added is equal to the moles of HCl present in the solution to be titrated. Moreover, the moles can be calculated as the product of the concentration of base or acid (Cb or Ca) and the volume (Vb and Va), as follows:
moles NaOH = moles HCl
Cb x Vb = Ca x Va
Thus, we calculate the concentration of HCl (Ca), as follows:
Ca = (Cb x Vb)/Va = (0.146 M x 47.5 mL)/(25.0 mL)= 0.277 M
The endpoint in tiration is the point where an indicatior's halfway thru its color change. Equivalence point is where moles/stoichiometry of the system is satisfied (moles of reactants are equal to each other).
Titrating a strong acid with a strong base results in a salt that is neutral. Phenolphthalein changes color in the range <span>8.3 – 10. It is very easy to spot the change as it is colorless in acidic (< 8.3) and pink in basic (> 10).
pH will rapidly change near titration equivalence point. </span><span>Only one drop of the titrant
causes this large change, the color change of phenolphthalein does not
occur on the equivalence point, but IT IS within about 1 drop. <span>It would be considered an "acceptable uncertainty" in using titration
to determine concentration by volumetric measurement.</span></span>
1. Coefficient
Since it is a number that constant for the given substance
Answer:
Explanation:
Weathering occurs fastest in hot, wet climates. It occurs very slowly in hot and dry climates.
Answer:
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