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marin [14]
3 years ago
8

How do I calculate the pH of the solution given the following [H3O+] or [OH−] values?[OH−] = 4.0×10^−11 M?

Chemistry
1 answer:
Usimov [2.4K]3 years ago
4 0
I think it’s i have no clue
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Which net ionic equation describes the reaction between K3PO4(aq) when it is mixed with Al(NO3)3(aq)?
Wittaler [7]
K₃PO₄<span>(aq) reacts with Al(NO</span>₃)₃(aq) and form AlPO₄(s) and KNO₃(aq) as the products. 

Before writing net ionic reaction, following steps should be followed.

Step 1 : Write the balanced chemical equation for the reaction and indicate the state of compound as aq,s,g or l.
      K₃PO₄(aq) + Al(NO₃)₃(aq) → AlPO₄(s) + 3KNO₃(aq) 

Step 2 : Identify the ionic species which dissolve in water to form ions.
K₃PO₄(aq) → 3K⁺(aq) + PO₄⁻(aq) 
Al(NO₃)₃(aq) → Al³⁺(aq) + 3NO₃⁻(aq) 
KNO₃(aq) → K⁺(aq) + NO₃⁻(aq)

Step 3 : Write the equation again by using ions.
3K⁺(aq) + PO₄⁻(aq) + Al³⁺(aq) + 3NO₃⁻(aq) → AlPO₄(s) +3K⁺(aq) + 3NO₃⁻(aq)

Step 4 : Identify the similar species in both side of the equation and cut off them.
3K⁺(aq) and 3NO₃⁻(aq) present in both sides. Hence, those ions can be cut off.

Step 5 : Get the final ionic equation.
The net ionic equation for the given reaction is 
      Al³⁺(aq) + PO₄⁻(aq) → AlPO₄(s) 
8 0
4 years ago
How many atoms of lead are contained in 0.532mol?​
Colt1911 [192]

Answer:

3.2043 x 10²³

Explanation:

No. of Mole of lead (Pb) = 0.532 mol

No. of atoms of lead = ?

Solution:

Formula Used to calculate

no. of moles = numbers of particles (ions, molecules, atoms) /Avogadro's number

Avogadro's no. = 6.023 x10²³

So,

The formula could be written as

no. of atoms of lead Pb = no. of moles x 6.023 x10²³

Put the values in above formula

no. of atoms of lead Pb = 0.532 mol x 6.023 x10²³

no. of atoms of lead Pb = 3.2043 x 10²³

so 3.2043 x 10²³ atoms of lead are contained in 0.532 mole.

6 0
3 years ago
A mechanical pencil is 14 cm long. What is its length in mm?
Tju [1.3M]

Answer:

140mm................

3 0
3 years ago
A 4 L sample of gas at 298 K and 2 atm contains 0.250 mol of gas. If we add another 0.250 mol of gas at the same pressure and te
andrey2020 [161]

Answer:

V_2=8L

Explanation:

Hello there!

In this case, considering the Avogadro's gas law, which treats the volume and moles in a directly proportional way via:

\frac{V_1}{n_1}=\frac{V_2}{n_2}

Which can be solved for the final volume, V2, as shown below:

V_2=\frac{V_1n_2}{n_1}

Thus, by plugging in the given data, we obtain:

V_2=\frac{4L*(0.250mol+0.250mol)}{0.250mol}\\\\V_2=8L

Regards!

4 0
3 years ago
Nitric oxide is unique because it:
musickatia [10]
I believe ur answer is b. Is not stored in vesicles but is made on demand.
 hope this helps.
8 0
3 years ago
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