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quester [9]
3 years ago
11

Is sodium benzoate soluble in NaOH, NaHCO3

Chemistry
2 answers:
krek1111 [17]3 years ago
6 0
It is water soluble so is also soluble in aqueous solutions of NaOH or NaHCO3.
storchak [24]3 years ago
6 0

Answer:

It's slightly soluble in an aqueous solution of NaHCO_{3}, and almost insoluble in an aqueous solution of NaOH.

Explanation:

Sodium benzoate comes from benzoic acid, which is a weak acid. It means that in an aqueous solution benzoic acid does not ionize easily to form the ions H_{3}O^{+} and C_{7}H_{5}O_{2} ^{-}

It also implies, according to the Le Châtelier's principle, that the ion C_{7}H_{5}O_{2}^{-} tends to form the acid C_{7}H_{6} O_{2} more easily. It can be seen in the following equation:

C_{7}H_{6} O_{2}  ⇔ C_{7}H_{5}O_{2}^{-}  + H_{3}O^{+}

In an aqueous solution, the equilibrium shifts to the left, thus letting water dissolve sodium benzoate.  But why? Because water in that case would produce enough H_{3}O^{+} ions to facilitate the disolution of sodium benzoate. It's shown by its solubility in water at 15°C (62.78g/100mL, according to Wikipedia).

In contrast, the presence of NaOH or NaHCO_{3}, both chemical species producing the OH^{-} ions in aqueous solution, would make the equilibrium shift to the right because it would be a higher need of H_{3}O^{+} ions to offset the presence of OH^{-}.

However, the effect of NaOH is not the same due to NaHCO_{3}, because the first is a strong base and the other is a weak one. Thereby it is reasonable to think that solubility of sodium benzoate is greater in water than in NaHCO_{3} and NaOH.

Solubility in water > solubility in  NaHCO_{3}> solubility in NaOH.

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Lemur [1.5K]
I believe the answer is C
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3 years ago
Barium nitrate has the formula Ba( NO3)2. Which statement is true about barium nitrate?
OLga [1]
I found these four statements for that question:

Each molecule contains four different elements.

Each molecule contains three atoms.

Each molecule contains seven different bonds.

Each molecule contains six oxygen atoms.

The last one is true. Each molecule contains six oxygen atoms.
The number to the right of O and of (NO3) ares subscripts.


The chemical formula uses subscripts to indicate the number of atoms.



The subscript 2 in (NO3)2 means that there are two NO3 radicals.


And the subscript 3 to the right of O means that each NO3 radical has three atoms of O.

Then, the number of atoms of O is 2 * 3 = 6.


So, the true statement is the last one: each molecule of Ba (NO3)2 has six atoms of O.


From that molecule you can also tell:

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4 0
3 years ago
A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 2.00 atm. The expansio
kondor19780726 [428]

Answer:

The final volume of the cylinder is 1.67 L

Explanation:

Step 1: Data given

Initial volume = 0.250 L

external pressure = 2.00 atm

Expansion does 288 J of work on the surroundings

Step 2: Definition of reversible work:

Wrev = -P(V2-V1) = -288 J

The gas did work, so V2>V1  (volume expands) and the work has a negative sign.(Wrev<0)

V2 = (-Wrev/P)  + V1

⇒ with Wrev = reverse work (in J)

⇒ with P = the external pressure (in atm)

⇒ with V1 = the initial volume

We can see that your pressure is in  atm  and energy in J

To convert from J to L * atm we should use a convenient conversion unit using the universal gas constants :

R = 8.314472 J/mol *K and R= 0.08206 L*atm/K*mol

V2 =- (-288 J * (0.08206 L*atm/K*mol  /8.314 J/mol *K))/2.00 atm  + 0.250L

V2 = 1.67 L

The final volume of the cylinder is 1.67 L

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zlopas [31]

Answer:

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Explanation:

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