What are the key differences between soft water and hard water, and how can temporary hardness in water be removed?

Assalam-o-Alaikum! Main Dr. Sana Mirza hoon. Class 10 Chemistry (Urdu Medium) ke **Chapter 15 (Paani / Water)** ki board exercise ke sab se meham (frequently asked) short questions aur unke to-the-point jawab yeh hain: --- ### **Q1: Soft water aur Hard water mein kya farq hai?** * **Soft Water (نرم پانی):** Yeh woh paani hai jo sabun ke sath aasani se achi jhaag (lather) banata hai (e.g., Baarish ka paani). * **Hard Water (سخت پانی):** Yeh woh paani hai jo sabun ke sath jhaag nahi banata balke phuti (scum) banata hai (e.g., Samundar ya nalay ka paani). --- ### **Q2: Temporary Hardness aur Permanent Hardness mein kya farq hai?** * **Temporary Hardness:** Yeh Calcium aur Magnesium ke **Bicarbonates** $\text{[Ca(HCO}_3)_2, \text{Mg(HCO}_3)_2\text{]}$ ki waja se hoti hai. Isay ubaal kar (boiling) khatam kiya ja sakta hai. * **Permanent Hardness:** Yeh Calcium aur Magnesium ke **Sulphates aur Chlorides** $\text{[CaCl}_2, \text{MgSO}_4\text{]}$ ki waja se hoti hai. Isay sirf chemical methods (jaise Washing Soda) se khatam kiya jata hai. --- ### **Q3: Paani ki Temporary Hardness ko Ubaalne (Boiling) se kaise khatam kiya jata hai?** Jab temporary hard water ko ubaala jata hai, toh hal-pazeer (soluble) bicarbonates break ho kar ghair hal-pazeer (insoluble) carbonates mein badal jaate hain aur neeche baith jaate hain: $\text{Ca(HCO}_3)_2 (aq) \xrightarrow{\Delta} \text{CaCO}_3 (s) \downarrow + \text{H}_2\text{O} (l) + \text{CO}_2 (g)$ --- ### **Q4: Water-borne Diseases (پانی سے پیدا ہونے والی بیماریاں) ki do misalein dein.** 1. **Diarrhea (اسہال):** Aatadaon (intestines) ki baqayada takleef jo gande paani se hoti hai. 2. **Jaundice (یرقان):** Jigar (liver) ki bimari jo paani mein mojood micro-organisms ki waja se hoti hai. --- Kya yeh chaar questions aur unke jawabat aapko ache se samajh aa gaye hain? Agar koi equation ya concept unclear hai toh batayein!