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tatuchka [14]
3 years ago
15

A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M

Chemistry
2 answers:
MArishka [77]3 years ago
5 0
The relation between hydroxide ion (OH-) and hydronium ion (H3O+) is given by:

pH + pOH = 14, which is equivalent to [H3O+] [OH-] = 10^ -14

=> [H3O+] = (10^ -14) / [OH-] = (10^ -14) / (1.4*10^-10) = 0.71 * 10^ - 4 = 0.071 * 10^-5

Answer: 0.071 * 10 ^ -5
 
finlep [7]3 years ago
4 0

Answer:

7.1 * 10x6^-5M

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6.63×10⁻³⁴Js × 3×10⁸m/s / λ = -0.85ev   - (-3.4ev )

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λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55ev

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λ = 19.89 ×10⁻²⁶ Jm / 4.08×10⁻¹⁹ J

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m to nm:

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Frequency = speed of electron / wavelength

by putting values,

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Frequency = 6.16 ×10¹⁴ s⁻¹

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