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Acid base or salt
PH
Titration+ Misc
Misc
100

HBr

acid

100

Determine the pH of a 0.010 M HNO3 solution.

pH = – log [H+] = – log [1.0 x 10-2]= -(-2.0)

pH = 2.0

100

n a titration, 25.0 mL of a 0.20 M NaOH solution is used to neutralize 10.0 mL of HCl. a) Write the equation for this neutralization reaction:

 NaOH + HCl à H2 O + NaOH

b) Calculate the molarity of the acid: A 1 mole moles H (M )(V ) 1 mole moles OH (M (V A A B - = B B + ) ) A 1 mole mole H (M )(10.0mL) 1 mole 1 mole OH (0.20 M)(25.0 mL) A B - = + MA = 0.50 HCl

100

What is the hydrogen ion concentration of an aqueous HCl solution that has a pH of 3.0?

pH = – log[H+] 3.0= – log[H+] [H+] = 1.0 x 10-3 M

[H+] = 1.0x10-3

200

KNO2

Salt

200

What is the pH of a 2.5 x 10-6 M solution of HCl? 

pH= 5.6

200

In a titration, 24.2 mL of 0.120 M Mg(OH)2 were required to neutralize 33.1 mL of H3 PO4 .

 Write the equation for this neutralization reaction: 2 H3PO4 + 3 Mg(OH)2 --> 6 H2 O + Mg3(PO4 ) 2 

 What is the molarity of the acid?


MA = 0.0585M H3PO4

200

. Determine the pH of a 0.035M H2 SO4 solution.

pH= 1.2

300

Ba(OH)2

Base

300

Calculate the [H+] of a solution with pH = 3.2

H = – log[H+] 3.2 = – log[H+] [H+] = 6.3 x 20-4 M

300

Convert 256.3 g sodium carbonate to formula units.

formula units Na CO 256.3 g Na CO x 106.0 g Na CO mol Na CO x 1 mol Na CO 6.02 x 10 formula units Na CO 

=  1.46 x 1024 formula units Na

300

The pH of a 0.010M Mg(OH)2 solution is

pH=12

400

KC2H3O2

salt

400

Calculate the pH of a 1.4 x 10-2 M NaOH solution

[H+][OH- ] = 1.0 x 10-14 [H+][1.4 x 10-2] = 1.0 x 10-14 [H+] = 7.1 x 10-13 M pH = – log[H+] = – log[7.1 x 10-13] = pH=12

400

How many moles are contained in 0.43 g Al2 O3?

mol Al O 0.43 g Al O x g Al O mol Al O 4.2 x 10 mol Al O 102.0 

=4.2x10-3    

400

How many atoms are contained in 3.46 moles of magnesium?

atoms Mg 3.46 mol Mg x mol Mg 6.02 x 10 atoms Mg 

=2.08 X 10 atoms Mg

500

How do we differentiate between salt, acid and base?

H+ OH 

K or Cl 

500

Calculate the [OH- ] of a solution with a [H+] of 9.3 x 10-4 M

[H+][OH- ] = 1.0 x 10-14 [9.3 x 10-4][OH- ] = 1.0 x 10-14 [OH- ] = 1.1 x 10-11

500

The number of silicon atoms in 42.1 g of silicon is?

9.02x1023

500

Human blood has a pH of 7.4. Calculate the [H+] concentration.

[H+] = 4.0 x 10-8 M