More practice - adding acid to a buffer 1 Calculate the pH change that takes place when 100.0 mL of 0.0500 M HCl are added to 400.0 mL of a buffer solution that is 0.200 M in NH, and 0.300 M in NH C1. The K, of NH, = 1.8 x 10. Answer: pH of buffer= 9.08, pH after addition of NaOH 9.03,Change = 0.05 =

Calculate the electrostatic force of repulsion for two protons separated by 93.0 pm. The charge of a proton is q = 1.6 x 10-1⁹ C. Express your answer to two significant figures and include the appropriate units. Fel = μA 2.7.10 6 Submit N Previous Answers Request Answer ? X Incorrect; Try Again; 5 attempts remaining Use the equation Fel = K(Q₁ Q₂/d²) to find the electrostatic force between the two particles. Q₁ and Q2 are the charges on the particles (charge of a proton here), and d is the distance of separation. The constant is given in the introduction and has the units Nm²/C². This means that the distance must be converted from picometers to meters using the relation 1 pm = 1 × 10¯ m. -12

What is the boiling point of the unknown substance Xin K(Kelvin)? X(t) = X(g) AH-(kJ mol1) S°J mol1K1) X(g) -82.0 238 | X({) | -101 144 Express your answer in decimal notation rounded to three significant figures.

When an object with an electric charge of −3.0μC is 8.0cm from an object with an electric charge of 6.0μC, the force between them has a strength of 25.28N. Calculate the strength of the force between the two objects if they are 24.cm apart.   Round your answer to 2 significant digits.