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100ml of 0.200M HCl is titrated with 0.250M NaOH.
1. What is the pH of the solution after 50.0ml of base has been added?
2. What is the pH of the solution at the equivalence point?
♦ Relevant knowledge
Titration of Strong Acid
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Titration is a method to find the strength or concentration of an unidentified acid or base. The most significant feature of a titration chart is the equivalence level. This is where the change in the pH per amount of titrant added is the highest. This indicates that the levels of base and acid at this point are equal.
This problem was solved by stoichiometry or balance reaction. It is a concept that indicates the relationship between any chemical reaction’s reactant and product.
Reaction of acid-base neutralization
Acid-base neutralization is when an acid reacts with a base to create water or solvent.
Take, for example:
Ca(OH)2(aq) + 2HNO3(aq) -> 2H20(l) + Ca(NO3)2(aq)
a) Molarity:
The amount of moles of solute in a one liter of solution is referred to as the molarity of the solution. It is represented with M. Molarity of any solution is a proportion of moles of solutes per liter of solution. It can be expressed using the following formula:
Titration of an acid and a base
Titration of an Acid with Base is a method to determine the amount of an acid or base by adding a calculated amount of a base or acid.
b) Equivalent point:
An equivalent point is an acid-base titration point where acid and base are present in the same amount.
c) Indicator:
An indicator of acid-base, or color change in indicator of acid-base titration, is a compound which changes color according pH changes to solution. The indicator of acid-base is a color that changes as the solution becomes more acidic or less acidic.
d) End point:
The end point of acid-base titration refers to the point at which acidic solutions become basic or acidic solutions. At this point, the indicator’s color changes. An indicator is used in acid-base Titration to determine the end point.
The following expression is used to calculate the number moles:
[Part a]
This is the balance chemical reaction between strong acid and strong bas:
The following steps will allow you to calculate the moles of acid or base:
The balance reaction of 1 mole HCl to 1 mole NaOH is called the “balance reaction”. Accordingly 0.0125 moles NaOH mole can be reacted with 0.0125 moles HCl.
Moles of HCl excess present, which are calculated as follows:
The total volume of reaction is the volume of HCl + the volume of NaOH
100ml + 50ml = 150ml
Calculate the new molarity for HCl by following these steps:
HCl refers to a strong acid. Therefore, the molarity HCl equals the hydrogen ion concentration.
The pH determines the nature of the solution. It is:
Answer: [Part a]
This means that pH when 50.0ml in base is added, will be 1.30.