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3 years ago

How much water must be added to make a 1.0 M solution from 250. mL of a 2.75 M solution?

Chemistry

1 answer:

Stels [109]3 years ago

4 0

700 mL ....................

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A buffer solution contains 0.496 M hydrocyanic acid and 0.399 M sodium cyanide . If 0.0461 moles of sodium hydroxide are added t

pochemuha

Answer : The pH of the solution is, 9.63

Explanation : Given,

The dissociation constant for HCN = $pK_a=9.31$

First we have to calculate the moles of HCN and NaCN.

$\text{Moles of HCN}=\text{Concentration of HCN}\times \text{Volume of solution}=0.496M\times 0.225L=0.1116mole$

and,

$\text{Moles of NaCN}=\text{Concentration of NaCN}\times \text{Volume of solution}=0.399M\times 0.225L=0.08978mole$

The balanced chemical reaction is:

$HCN+NaOH\rightarrow NaCN+H_2O$

Initial moles 0.1116 0.0461 0.08978

At eqm. (0.1116-0.0461) 0 (0.08978+0.0461)

0.0655 0.1359

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=9.31+\log (\frac{0.1359}{0.0655})$

$pH=9.63$

Therefore, the pH of the solution is, 9.63

4 0

4 years ago

A reaction where one element takes the place of another element in a compound is an example of which type of reaction? A. Single

Shtirlitz [24]

A. Single Replacement

8 0

4 years ago

Based on the graphs below, which of the following substances has the highest specific heat capacity? Assume each experiment bega

ivann1987 [24]

It will not heat as fast with water

5 0

4 years ago

Transferring charge by touching or rubbing is called-

mina [271]

Answer:

A) Charging by contact

Explanation:

Transfer of heat by direct contact, Heat energy is conducted from the hotter medium to the cooler medium

3 0

3 years ago

Correct answer will be marked brainliest!

tigry1 [53]

Answer:

0.0660 moles

Explanation:

Change torr to atm and change celcius to kelvin.

(1.35L)(.987 atm)/(0.08206 L atm /mol k)(290k)

= 0.0660 mol

4 0

3 years ago