A 50.0 mL solution of 0.141 M KOH is titrated with 0.282 M HCl . Calculate the pH of the solution after the addition of each of the given amounts of HCl .

pH =1 2.84

Explanation:

First we have to start with the reaction between HCl and KOH:

Now for example, we can use a volume of 10 mL of HCl. So, we can calculate the moles using the molarity equation:

We know that and we have the concentration of the HCl , when we plug the values into the equation we got:

We can do the same for the KOH values ( and ).

So, we have so far 0.00282 mol of HCl and 0.00705 mol of KOH. If we check the reaction we have a molar ratio 1:1, therefore if we have 0.00282 mol of HCl we will need 0.00282 mol of KOH, so we will have an excess of KOH. This excess can be calculated if we substract the amount of moles:

Now, if we want to calculate the pH value we will need a concentration, in this case KOH is in excess, so we have to calculate the concentration of KOH. For this, we already have the moles of KOH that remains left, now we need the total volume:

Now we can calculate the concentration:

Now, we can calculate the pOH (to calculate the pH), so:

Now we can calculate the pH value:

43.452

step-by-step explanation:

284 times .153 = 43.452

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance