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Liono4ka [1.6K]
3 years ago
11

PLEASE HELP HELP I NEED THIS ASAP

Chemistry
2 answers:
Sergeu [11.5K]3 years ago
5 0
Wait SORRY HELP WITH WHAT?!!
Rainbow [258]3 years ago
5 0
The hydrogen-ion concentration is 1000 times greater.
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The Ka for formic acid (HCO2H) is 1.8 × 10-4. What is the pH of a 0.35 M aqueous solution of sodium formate (NaHCO2)?
anzhelika [568]

Answer:

9.36

Explanation:

Sodium formate is the conjugate base of formic acid.

Also,

K_a\times K_b=K_w

K_b for sodium formate is K_b=\frac {K_w}{K_a}

Given that:

K_a of formic acid = 1.8\times 10^{-4}

And, K_w=10^{-14}

So,

K_b=\frac {10^{-14}}{1.8\times 10^{-4}}

K_b=5.5556\times 10^{-11}

Concentration = 0.35 M

HCOONa    ⇒     Na⁺ +    HCOO⁻

Consider the ICE take for the formate  ion as:

                                   HCOO⁻ + H₂O   ⇄   HCOOH + OH⁻

At t=0                              0.35                            -              -

At t =equilibrium           (0.35-x)                          x           x            

The expression for dissociation constant of sodium formate is:

K_{b}=\frac {[OH^-][HCOOH]}{[HCOO^-]}

5.5556\times 10^{-11}=\frac {x^2}{0.35-x}

Solving for x, we get:

x = 0.44×10⁻⁵  M

pOH = -log[OH⁻] = -log(0.44×10⁻⁵) = 4.64

pH + pOH = 14

So,

<u>pH = 14 - 4.64 = 9.36</u>

5 0
3 years ago
Where is DNA found in your body?
Dennis_Churaev [7]

Answer:

Researchers refer to DNA found in the cell's nucleus as nuclear DNA. An organism's complete set of nuclear DNA is called its genome. Besides the DNA located in the nucleus, humans and other complex organisms also have a small amount of DNA in cell structures known as mitochondria.

<h2>hσpє ít hєlpѕ uh</h2><h3>plz mαrk mє αѕ вrαínlíєѕt</h3>
8 0
3 years ago
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Washing machines use a large amount of water. A student suggested that old pairs of stained jeans which have to be washed more f
sukhopar [10]

Answer:

C |||| It is not practical because it takes a huge amount of water to produce a new pair of jeans

Explanation:

If you're doing flvs then it's C.

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What are the 4 properties of hydrogen bonds?
tiny-mole [99]

Answer:

Solubility, Volatility, Viscosity and Surface Tension.

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What is the name of the ionic compound CaCN?
devlian [24]

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Calcium cyanamide

Explanation:

I think it has to be calcium cyanide, because of the cyanamide ion (CN).

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