Hello!
The chemical reaction for the dissociation of Formic Acid is the following:
HCOOH + H₂O ⇄ HCOO⁻ + H₃O⁺
From this reaction we can use the Henderson-Hasselbach equation to find the pH, but first we need to find the value for the pKa:
pKa=-log(Ka)=3,75
pH=pKa + log([HCOO⁻]/[HCOOH])
pH=3,75 + log (0,295/0,205)
pH= 3,90
Have a nice day!
Answer:
Ni (s) is oxidized because it loses electrons. This makes it the reducing agent.
CuCl₂ (aq) is reduced because it gains electrons. This makes it the oxidizing agent.
Explanation:
In the reaction:
Ni(s) + CuCl₂(aq) → Cu(s) + NiCl₂(aq)
Ni (s) is oxidized because it loses electrons. This makes it the reducing agent.
------------> Ni (s) has an oxidation number of 0. All lone atoms (that are not ions) have a 0 oxidation number.
-------------> In NiCl₂ (aq), chlorine must have an oxidation number of -1, and because there are two chorine atoms, they contribute a total -2 charge. To make the overall charge neutral, nickel must have an oxidation number of +2 to balance the charges.
--------------> Because nickel goes from an oxidation number of 0 to +2, this indicates that it lost electrons and was reduced.
CuCl₂ (aq) is reduced because it gains electrons. This makes it the oxidizing agent.
-------------> In CuCl₂ (aq), chlorine must have an oxidation number of -1, and because there are two chorine atoms, they contribute a total -2 charge. To make the overall charge neutral, copper must have an oxidation number of +2 to balance the charges.
------------> Cu (s) has an oxidation number of 0. All lone atoms (that are not ions) have a 0 oxidation number.
--------------> Because copper goes from an oxidation number of +2 to 0, this indicates that it gained electrons and was oxidized.
I think D?? I apologize if not-check in other answers to be sure ^^
Answer:
Glycogen. Cellulose. Amylose. Cellulose. Amylopetin and Glycogen. Amylopetin and Cellulose.
Explanation:
Glycogen is the form that glucose is stored in human body.
Cellulose is the structural part of plant cell walls and human cannot digest it.
Amylose is the polysaccharide linked mainly by the the bonds of 
1,4 glycosidic.
Cellulose is an unbranched polysaccharide linked mainly by the bonds of 
1,4 glycosidic.
Amylopetin and Glycogen are branched polysaccharides linked by the bonds of 1,4 glycosidic and 1,6 glycosidic.
Amylopetin and Cellulose are mainly stored in plants.
Answer:
1) 6.0 atm.
2) 2.066 atm.
Explanation:
- From the general law of ideal gases:
<em>PV = nRT.</em>
where, P is the pressure of the gas.
V is the volume of the container.
n is the no. of moles of the gas.
R is the general gas constant.
T is the temperature of the gas (K).
<em>1) What is the new pressure of 150 mL of a gas that is compressed to 50 mL when the original pressure was 2.0 atm and the temperature is held constant?</em>
- At constant T and at two different (P, and V):
<em>P₁V₁ = P₂V₂.</em>
P₁ = 2.0 atm, V₁ = 150.0 mL.
P₂ = ??? atm, V₂ = 50.0 mL.
<em>∴ P₂ = P₁V₁/V₂</em> = (2.0 atm)(150.0 mL)/(50.0 mL) = <em>6.0 atm.</em>
<em>2. A sample of a gas in a rigid container at 30.0°C and 2.00 atm has its temperature increased to 40.0°C. What will be the new pressure?</em>
<em></em>
- Since the container is rigid, so it has constant V.
- At constant V and at two different (P, and T):
<em>P₁/T₁ = P₂/T₂.</em>
P₁ = 2.0 atm, T₁ = 30.0°C + 273 = 303 K.
P₂ = ??? atm, T₂ = 40.0°C + 273 = 313 K.
<em>∴ P₂ = P₁T₂/T₁ </em>= (2.0 atm)(313.0 K)/(303.0 K) =<em> 2.066 atm.</em>
