I need help with 5 chem problems please!!!!

Question

please help me with the reaction

1. solid magnesium oxide is reacted with hydrochloric acid

2. ammonium bromide sodium hydroxide

3. equal numbers of moles of potassium hydroxide and phosphoric acid react

4. sodium fluoride reacts with dilute nitric acid

5. solid titanium (IV) carbonate hydrochloric acid

Answer 1

I agree with Steve's first three answers.

Am not certain about #4... HF is produced by the action of strong conc acid (eg H2SO4) on fluoride salts...in this water soln I think we would wind up simply with a mixture of the four ions.

#5 is not complete...the H2O formed reacts with TiCl4 to form TiO2, re-liberating the HCl...so the overall eq is Ti(CO3)2 --(HCl)--> TiO2 + 2CO2...the HCl merely acting as a catalyst for the decomposition of Ti(CO3)2.

Answer 2

1. solid magnesium oxide is reacted with hydrochloric acid

MgO (s) & 2 HCl (aq) --> MgCl2 (aq) & H2O

2. ammonium bromide sodium hydroxide

NH4Br (aq) & NaOH (aq) --> NH4OH (aq) & NaBr(aq)

NH4OH (aq) is preferably written by most people as NH3 & H2O

3. equal numbers of moles of potassium hydroxide and phosphoric acid react

KOH (aq) & H3PO4 (aq) --> KH2PO4 (aq) & H2O

4. sodium fluoride reacts with dilute nitric acid

NaF (aq) & HNO3 (aq) --> HF (aq) & NaNO3 (aq)

(HF is a very stable weak acid whose K= 6.8e-4 ,..  for a 0.1 Molar solution, 92% is intact as the HF molecule)

5. solid titanium (IV) carbonate hydrochloric acid

Ti(CO3)2 & 4 HCl (aq) --> TiCl4 (aq) & 2 CO2 (g) & 2 H2O