Hey there!:
Write the molecular equation for the reaction of MgSO4 with Pb(NO3)2 :
MgSO4(aq) + Pb(NO3)2(aq) ---> Mg(NO3)2(aq) + PbSO4(s)
Write the total ionic equation for the reaction :
Mg²⁺ (aq) + SO₄⁻² (aq) + Pb²⁺ (aq) + 2 NO₃⁻¹ (aq) + PbSO₄(s)
Therefore:
Cancel the spectator ions on both sides:
Pb²⁺ (aq) + SO₄⁻² (aq) ---> PbSO4(s)
Hope that helps!
Answer: B) 10 ml
Explanation:
According to the dilution law,
where,
= molarity of stock
solution = 1.0 M
= volume of stock
solution = 2.0 ml
= molarity of dilute
solution = 0.20 M
= volume of diluted
solution = ?
Putting in the values we get:
Therefore, final volume reading is 10 ml
It is predicted to lie at a wavelength of 91.2 nm.
Rydberg equation is a mathematical formula that is used to predicts the wavelength of light resulting from an electron moving between energy levels of an atom. Rydbery equation is used to describe the spectral wavelengths of chemical elements. The equation is made up of different components, which include n1 and n2. The n1 of the equation has a value of 1 while the n2 runs from 2 to infinity; this makes the spectral lines to converge at point 91.2 nm.
Answer:
![$\lambda_D =964 \ nm$](https://tex.z-dn.net/?f=%24%5Clambda_D%20%3D964%20%20%5C%20nm%24)
Explanation:
We know, the double layer length of pure water is given by :
![$\lambda _{D}= \left(\frac{\epsilon k_B T}{2e^2z^2N_AC_i}\right)^{1/2}$](https://tex.z-dn.net/?f=%24%5Clambda%20_%7BD%7D%3D%20%5Cleft%28%5Cfrac%7B%5Cepsilon%20k_B%20T%7D%7B2e%5E2z%5E2N_AC_i%7D%5Cright%29%5E%7B1%2F2%7D%24)
![$\lambda _{D}= \left(\frac{(78.3)\times(8.85 \times 10^{-21})\times (1.38 \times 10^{-23})\times 300}{2 \times(1.6 \times 10^{19})^2 \times 1^2 \times (6.023 \times 10^{23})\times (10^{-7}) \times 1000 }\right)^{1/2}$](https://tex.z-dn.net/?f=%24%5Clambda%20_%7BD%7D%3D%20%5Cleft%28%5Cfrac%7B%2878.3%29%5Ctimes%288.85%20%5Ctimes%2010%5E%7B-21%7D%29%5Ctimes%20%281.38%20%5Ctimes%2010%5E%7B-23%7D%29%5Ctimes%20300%7D%7B2%20%5Ctimes%281.6%20%5Ctimes%2010%5E%7B19%7D%29%5E2%20%5Ctimes%201%5E2%20%5Ctimes%20%286.023%20%5Ctimes%2010%5E%7B23%7D%29%5Ctimes%20%2810%5E%7B-7%7D%29%20%5Ctimes%201000%20%7D%5Cright%29%5E%7B1%2F2%7D%24)
Since, pH = -log ![$H^+$](https://tex.z-dn.net/?f=%24H%5E%2B%24)
![$[H^+]=10^{-7}$](https://tex.z-dn.net/?f=%24%5BH%5E%2B%5D%3D10%5E%7B-7%7D%24)
![$\lambda_D = \left(93.05 \times 10^_{-14}\right)^{1/2}$](https://tex.z-dn.net/?f=%24%5Clambda_D%20%3D%20%5Cleft%2893.05%20%5Ctimes%2010%5E_%7B-14%7D%5Cright%29%5E%7B1%2F2%7D%24)
![$\lambda_D = \sqrt{93.05} \times 10^{-7}$](https://tex.z-dn.net/?f=%24%5Clambda_D%20%3D%20%5Csqrt%7B93.05%7D%20%5Ctimes%2010%5E%7B-7%7D%24)
![$\lambda_D =9.64 \times 10^{-7}$](https://tex.z-dn.net/?f=%24%5Clambda_D%20%3D9.64%20%5Ctimes%2010%5E%7B-7%7D%24)
![$\lambda_D =964 \times 10^{-9} \ m$](https://tex.z-dn.net/?f=%24%5Clambda_D%20%3D964%20%5Ctimes%2010%5E%7B-9%7D%20%5C%20m%24)
![$\lambda_D =964 \ nm$](https://tex.z-dn.net/?f=%24%5Clambda_D%20%3D964%20%20%5C%20nm%24)