1) Washing soda is hydrated sodium carbonate, Na2CO3. xH20. A student wished to determine the value of x by carrying out a titration, with the following results:

5.13 g of washing soda crystals were dissolved in water and the solution was made up to 250 cubic cm in a standard volumetric flask

25.0 cubic cm of this solution reacted exactly with 35.8 cubic cm of 0.100 mol. dm-3 hydrochloric acid and carbon dioxide was produced.

(a) (i) Write a balanced equation for the reaction between Na2CO3 and HCI.

(ii) Calculate the amount, in moles, of HCl in the 35.8 cm3 solution used in the titration.

(iii) Use your answers to (i) and (ii) to calculate the amount, in moles, of Na2CO3, in the 25.0 cubic cm of solution used in the titration.

(iv) Use your answer to (iii) to calculate the amount, in moles, of Na2CO3, in the 250 cm3 of solution in the standard volumetric flask.

(v) Hence, calculate the mass of Na2CO3, present in 5.13 g of washing soda crystals.

Predict the products of the following acid-base reactions, and predict whether the equilibrium lies to the left or to the right of the reaction arrow.part ao2-(aq)+h2o(l)< => express your answer as part of a chemical equation. identify all of the phases in your answer.o2-(aq)+h2o(l) < => oh-(aq)+oh-(aq)part bpredict whether the equilibrium lies to the left or to the right of the equation in previous part.h2o is a stronger acid than oh–, so the equilibrium lies to the right.h2o is a weaker acid than oh–, so the equilibrium lies to the left.h2o is a stronger acid than oh–, so the equilibrium lies to the left.h2o is a weaker acid than oh–, so the equilibrium lies to the right.part cch3cooh(aq)+hs? (aq) < => express your answer as part of a chemical equation. identify all of the phases in your answer.ch3cooh(aq)+hs-(aq) < => h2s(aq)+c2h3o2-(aq)h2s(aq)+c2h3o2-(aq)part dpredict whether the equilibrium lies to the left or to the right of the equation in previous part.ch3cooh is a weaker acid than h2s, so the equilibrium lies to the right.ch3cooh is a weaker acid than h2s, so the equilibrium lies to the left.ch3cooh is a stronger acid than h2s, so the equilibrium lies to the right.ch3cooh is a stronger acid than h2s, so the equilibrium lies to the left.part eno2-(aq)+h2o(l) < => express your answer as part of a chemical equation. identify all of the phases in your answer.no2-(aq)+h2o(l) < => part fpredict whether the equilibrium lies to the left or to the right of the equation in previous part.hno2 is a stronger acid than h2o, so the equilibrium lies to the right.hno2 is a weaker acid than h2o, so the equilibrium lies to the left.hno2 is a stronger acid than h2o, so the equilibrium lies to the left.hno2 is a weaker acid than h2o, so the equilibrium lies to the right.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.